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Develop a lot-for-lot solution and calculate total relevant costs for the gross

ID: 371249 • Letter: D

Question

Develop a lot-for-lot solution and calculate total relevant costs for the gross requirements in the following table*. Period 1 2 3 4 5 6 7 8 9 10 11 12 Gross requirements 20 40 30 70 20 10 70 60 Holding costs $3.50/unit/week; setup cost $150, lead time= 1 week, beginning inventory-40. Develop a lot-for-lot solution (enter your responses as whole numbers) Period Gross requirements On-hand at beginning of period40 On-hand at end of period Order receipt Order release 1 2 3 4 5 6 7 89 10 1 40 30 70 20 10 70 60

Explanation / Answer

Please find below filled up NRP table as required :

Order qty”Lot-for-Lot, Lead time : 1 week

1

2

3

4

5

6

7

8

9

10

11

12

Gross requirement

20

40

30

70

20

10

70

60

On hand at beginning of period : 40

40

20

20

0

0

0

0

0

0

0

0

0

On hand at end of period

20

20

0

0

0

0

0

0

0

0

0

0

Order receipt

0

0

20

0

30

70

20

0

10

70

0

60

Order release

0

20

0

30

70

20

0

10

70

0

60

0

It is to be noted that:

Under such situation . Order receipt = Gross requirement – On hand at beginning of period

Since Lead time = 1 week, Order receipt for period t = Order Release for period t-1

“On hand at end of period “ = Gross requirement – On hand at beginning of period – Order receipt

On hand at end of period = On hand at beginning of period – Gross requirement

We presume that set up cost is incurred everytime an order is released

There are 7 numbers of Order Releases .

Therefore , total set up cost = $150 x 7 = $1050

Given, Holding cost = $3.50/unit / week

There are 20 + 20 = 40 units which are held up in inventory for week. Therefore total holding cost = $3.5 x 40 = $140

Hence, Total relevant cost = Gross Holding cost + Gross Set up cost = $1050 + $140 = $1190

Order qty”Lot-for-Lot, Lead time : 1 week

1

2

3

4

5

6

7

8

9

10

11

12

Gross requirement

20

40

30

70

20

10

70

60

On hand at beginning of period : 40

40

20

20

0

0

0

0

0

0

0

0

0

On hand at end of period

20

20

0

0

0

0

0

0

0

0

0

0

Order receipt

0

0

20

0

30

70

20

0

10

70

0

60

Order release

0

20

0

30

70

20

0

10

70

0

60

0