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1. Diketahui:Kebutuhan 1 tahun ( S ) = 800

Carrying Cost ( C ) = $2

Ordering Cost ( O ) = $50

Lead Time = 5 daysSafety Stock = 10 days

Ditanya:

a) Economic Order Quantity (EOQ)

b) Average level of inventory

c) Reorder Point (ROP)

d) Jika perusahaan tidak mempunyai safety stock, carilah:

-Order Cost

- Carrying Cost

- Reorder Point

- Total Cost

- Average level of inventory

- Number of order per year

- Economic Order Quantity (EOQ)

Jawab:

a) Economic Order Quantity (EOQ) =

=

=

=

= 200 unit

b) Average level of inventory =

+ safety stock

=

+ 22= 100 + 22

= 122 unit

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c) Daily usage =

=

= 2,22

Safety stock = daily usage x 10

= 2,22 x 10 = 22,2

Reorder Point (ROP) = leadtime x daily usage

= 5 2,22 = 11

ROP Gabungan = 11 + 22,2

= 33,233 unit

d1) Order Cost (OC) = O

= 50

= $200

d2) Carrying Cost (CC) = C

= 2

= $200

d3) Daily usage =

=

= 2,22

ROP = lead time daily usage

= 5 2,22

= 11,1111 unit

d4) Total Cost = Order Cost + Carrying Cost

= 200 + 200

= $400

d5) Average level of inventory =

=

= 100 unit

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d6) Frequency =

== 2

Number of order per year =

= 90 days

d7) Economic Order Quantity (EOQ) =

=

=

=

= 200 unit

2. Diketahui:

Kebutuhan 1 tahun ( S ) = 10000 unit ban 4kg karet

= 40000

Carrying Cost ( C ) = 20% dari harga beli

= 20% 40 = Rp 8

Order Cost ( O ) = Rp 25

Ditanya:

a) Economic Order Quantity (EOQ)

b) Total Maximum Inventory

c) Average level of inventory

d) Banyaknya pesanan dalam 1 tahun

e) Total Cost Inventory

f) Order Cost, Carrying Cost, Total cost

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Jawab:

a) Economic Order Quantity ( EOQ ) = =

= = 500 unit

b) Total Maximum Inventory =safety stock+ EOQ= 300 + 500

= 800 unit

c) Average level of inventory =

+ safety stock

=

+ 300

= 550 unit

d) Banyak Pemesanan dalam 1 tahun =

=

=

= 80 unit

e) Total cost inventory = [ (O ) + (C ) ]= [ (25 ) + (8

) ]

=

+ 2000

= Rp 12000

f) Order Cost ( OC ) = O = 25

= Rp 2500

Carrying Cost ( CC ) = C

= 8

= Rp 1600

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Total Cost ( TC ) = Order Cost + Carrying Cost

= 2500 + 1600

= Rp 4100

3. Diketahui:

Kebutuhan 1 tahun ( S ) = 20000 unit donut 2kg tepung

= 40000

Carrying Cost ( C ) = 40% dari harga beli = 40% x 50 = 20

Order Cost = Rp. 50

Safety stock = Rp. 40

Ditanya:

a) Economic Order Quantity (EOQ)b) Jumlah maksimum persediaanc) Rata-rata Persediaand) Pemesanan dalam satu tahune) Total boayta persediaanf) Total biaya penyimpanan, total biaya pemesanan, dan total biaya persediaan, jika Q =

1000 kg

Jawab:

a) Economic Order Quantity (EOQ) =

=

=

=

= 400 unit

b) Jumlah maksimum persediaan = EOQ + Safety Stock

= 400 + 200

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= 600 unit

c) Rata-rata Persediaan =

+ safety stock

=

+ 200

= 400 unit

d) Banyak pesanan dalam 1 tahun :

=

= 100 unit

e) Jika Q = 1000 kg, maka:

Order Cost (OC) = O

= 40

= Rp. 1600

Carrying Cost (CC) = C

= 20

= Rp. 10000

Total Cost = Ordering Cost + Carrying Cost

= 1600 + 10000

= Rp. 11600

Order Cost (OC) = O

= 40

= Rp. 4000

Carrying Cost (CC) = C

= 20

= Rp. 4000

Total Cost = Order Cost + Carrying Cost

= 4000+ 4000

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= Rp. 8000