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Contoh-contoh-latihan-PPIC

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									Inventory Management, contoh (1)
Menghitung EOQ dengan cara trial and errorl
Kebutuhan pertahun:                           8000     unit
Biaya sekali order:                            12.5    (ribu rp)
Biaya penyimpanan:                             20%     dari nilai barang per tahun
Harga barang:                                     1    (ribu rp)

    Jumlah order    Lot size      rerata inventory /           Nilai rerata          biaya penyimpanan
                                              tahun       inventory /tahun

               1       8000                   4000                     4000                       800
               2       4000                   2000                     2000                       400
               4       2000                   1000                     1000                       200
               8       1000                    500                      500                       100
              16        500                    250                      250                        50

Inventory Management, contoh (2)
Menghitung EOQ dengan perhitungan aljabar
Dari contoh (1)
2DS               200000
2DS/H            1000000
EOQ                  1000
Biaya order   Total
              biaya

      12.5    812.5
       25      425
       50      250
      100      200
      200      250
Inventory Management, contoh (3)
Menghitung perkiraan kebutuhan
Tahun           Kebutuhan (ton)
         1                    2
         2                    3
         3                    6
         4                   10
         5                    8
         6                    7
         7                   13
         8                   14
         9                   14
        10                   18
        11                   19
           Inventory Management, Contoh (3)
           Klasifikasi ABC
               No          N(Rp)      UPT(unit/th)   NPT(Rp/th)   %NPT    %NPT kum    KELAS
                1             50           50000       2500000     38.6
                2            110             2000       220000      3.4
                3            160               400       64000      1.0
                4             80               700       56000      0.9
                5             70             4800       336000      5.2
                6            150             1300       195000      3.0
                7            150           17000       2550000     39.4
                8            200               300       60000      0.9
                9             90             5000       450000      6.9
               10            120               400       48000      0.7
              Total                                    6479000
           Catatan: Satuan Rp dikali 1000

urutan berdasar NPT dan perhitungan prosentase
                No         N(Rp)     UPT(unit/th)    NPT(Rp/th)   %NPT    %NPT kum    KELAS
                 7           150           17000       2550000     39.4        39.4     A
                 1             50          50000       2500000     38.6        77.9     A
                 9             90           5000        450000      6.9        84.9     B
                 5             70           4800        336000      5.2        90.1     B
                 2           110            2000        220000      3.4        93.5     B
                 6           150            1300        195000      3.0        96.5     C
                 3           160              400        64000      1.0        97.5     C
                 8           200              300        60000      0.9        98.4     C
                 4             80             700        56000      0.9        99.3     C
                10           120              400        48000      0.7       100.0     C
Contoh MPS

                                               A      B         C         D    Std. Cap
                                       L1     15     20        15                    40
                                       L2     20     20        30        10          40
                                       L3     25     25        20        15          40

                                                          Week 1                                    We
Produk                                         A      B            C      D    Cap used     A
Initial Inventory                            100    300       250       350                  0
Gross requirement                           2000    400       500      1000                600
Standar lot size                             200    200       200       200                200
Safety inventory                             400    500       400       300                400
Net requirement                             2400    600       800      1000               1000
                                    L1                        600                   40
                                    L2       800                                    40
       MPS
                                    L3                                  720         48
                                  Total      800       0      600       720                  0
Reqirement met                               900    300       500      1000                  0
Requirement not met                         1100    100          0         0              600
Service level                                0.45   0.75      1.00      1.00              0.00
Avergage service level in the period                   0.80                                      0.75
Ending inventory                               0       0      350        70                  0
Average inventory in the period               50    150       300       210                  0
Total avg inventory in the period                      710                                       470
Below safety inventory                       400    500        50       230                400
Below safety inventory in the period                  1180                                       1080
       Week 2                                       Week 3
  B             C     D    Cap used     A      B             C     D    Cap used     A
   0       350        70                 0    150       300        70                0
 650       650       600               700    650       650       600              200
 200       200       200               200    200       200       200              200
 500       400       300               400    500       400       300              400
1200       800      1000              1200   1000       800      1000              600
           600                  40                                            0
 800                            40                                            0
                    600         40                               600         40
800       600       600                  0      0         0      600                  0
650       650       600                  0   150       300       600                  0
   0         0         0              700    500       350          0              200
1.00      1.00      1.00              0.00   0.23      0.46      1.00              0.00
   0.75                                         0.42                                      0.0
150        300        70                 0      0         0        70                0
  75       325        70                 0     75       150        70                0
   470                                          295                                        35
350        100       230               400   500        400       230              400
  1080                                         1530                                       160
       Week 4
  B             C     D    Cap used
   0         0        70
 650       300       600
 200       200       200
 500       400       300
1200       800      1000
                                 0
                                 0
                                 0
   0         0         0
   0         0        70
650       300       530
0.00      0.00      0.12
   0.03
   0            0      0
   0            0     35
    35
500        400       300
  1600
CONTOH PERHITUNGAN MRP
MPS
Perioda                     1      2      3
A                         400    600    600
B                         200      0      0
ITEM
F
Perioda                     1      2      3
F-A                       800   1200   1200
F-B                       200      0      0
Gross requirement        1000   1200   1200
Scheduled receive         800   1000
Initial Inventroy         400    200      0
Net requirement             0      0   1200
Planned receive                        1200
End Inventory             200      0      0
Planned order            1200    900

G
Perioda                     1      2      3
G- A                      400    600    600
Gross requirement         400    600    600
Scheduled receive
Initial Inventroy         600    200      0
Net requirement             0    400    600
Planned receive                  400    600
End Inventory             200      0      0
Planned order             400    600    400

H
Perioda                     1      2      3
H-G                       400    600    400
Gross requirement         400    600    400
Scheduled receive         600
Initial Inventroy                200    200
Net requirement             0    400    200
Planned receive                  600    200
End Inventory             200    200      0
Planned order             600    200      0

I
Perioda                     1      2      3
I-G                       800   1200   1200
Gross requirement         800   1200   1200
Scheduled receive               1000
Initial Inventroy        1000    200      0
Net requirement             0      0   1200
Planned receive                  1200
End Inventory        200     0      0
Planned order       1200          900

J
Perioda                1     2      3
F-B                  400     0    900
Gross requirement    400     0    900
Scheduled receive    400
Initial Inventroy    100   100    100
Net requirement        0     0    800
Planned receive                   900
End Inventory        100   100    100
Planned order        900
  4
400
100


  4
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100
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900
900
  0




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400

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  4
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