# Problem 12-7 Eighty units of end item X are needed at the beginning of week 6, and another 30 units are needed at the beginning of week 8. Picture Prepare a material requirements plan for component D. D can only be ordered in whole cases (50 units per case). One case of D is automatically received every other week, beginning in week 1 (i.e., weeks 1, 3, 5, 7). Also, there are 30 units of B and 20 units of D now on hand. Lead times for all items are a function of quantity: one week for up to 100 units, two weeks for 101 to 200 units, three weeks for 201 to 300 units, and four weeks for 301 or more units. (Leave no cells blank – be certain to enter “0” wherever required.) Part D Beg. Inv. 1 2 3 4 5 6 7 8 Gross requirements Scheduled receipts On hand Net requirements Planned-order receipt Planned-order release

Problem 12-7

 Eighty units of end item X are needed at the beginning of week 6, and another 30 units are needed at the beginning of week 8.

 Prepare a material requirements plan for component D. D can only be ordered in whole cases (50 units per case). One case of D is automatically received every other week, beginning in week 1 (i.e., weeks 1, 3, 5, 7). Also, there are 30 units of B and 20 units of D now on hand. Lead times for all items are a function of quantity: one week for up to 100 units, two weeks for 101 to 200 units, three weeks for 201 to 300 units, and four weeks for 301 or more units. (Leave no cells blank – be certain to enter “0” wherever required.)

Part D      Beg. Inv.         1        2        3        4        5        6        7           8
Gross requirements
Scheduled receipts
On hand
Net requirements
Planned-order receipt
Planned-order release

Problem 12-9

 Assume that you are the manager of a shop that assembles power tools. You have just received an order for 56 chain saws, which are to be shipped at the start of week 8. Pertinent information on the saws is

 Item Lead Time (weeks) On Hand Components Saw 2 15 A(2), B(1), C(4) A 1 10 E(3), D(1) B 2 5 D(2), F(3) C 2 65 E(2), D(2) D 1 20 E 1 10 F 2 30

 b. Develop the material requirements plan for component E using lot-for-lot ordering. (Leave no cells blank – be certain to enter “0” wherever required.)

 Item: E(3) & E(2) LT = 1 wk. Beg. Inv. 1 2 3 4 5 6 7 8 Gross requirements Scheduled receipts Projected on hand Net requirements Planned order receipt Planned order release

Problem 12-12

 A firm that produces electric golf carts has just received an order for 200 carts, which must be ready for delivery at the start of week 8. Information concerning the product structure, lead times, and quantities on hand is shown in the following table. Use this information to do each of the following:

 Parts List for Electric Golf Cart Lead Time Quantity on Hand Electric golf cart 1 0 Top 1 40 Base 1 20 Top Supports (4) 1 200 Cover 1 0 Base Motor 2 300 Body 3 50 Seats (2) 2 120 Body Frame 1 35 Controls 1 0 Wheel assemblies (4) 1 240

 Develop a material requirements plan that will provide 200 golf carts by week 8 assuming lot-for-lot ordering. (Negative amounts should be indicated by a minus sign. Leave no cells blank – be certain to enter “0” wherever required.)

 Master Schedule for golf carts

 Week Beg. Inv. 1 2 3 4 5 6 7 8 Quantity

 Item: Golf Cart LT = 1 wk. Beg. Inv. 1 2 3 4 5 6 7 8 Gross requirements Scheduled receipts Projected on hand Net requirements Planned order receipts Planned order releases

 Item: Top LT = 1 wk. Beg. Inv. 1 2 3 4 5 6 7 8 Gross requirements Scheduled receipts Projected on hand Net requirements Planned order receipts Planned order releases

 Item: Supports (4) LT = 1 wk. Beg. Inv. 1 2 3 4 5 6 7 8 Gross requirements Scheduled receipts Projected on hand Net requirements Planned order receipts Planned order releases

 Item: Cover LT = 1 wk. Beg. Inv. 1 2 3 4 5 6 7 8 Gross requirements Scheduled receipts Projected on hand Net requirements Planned order receipts Planned order releases

 Item: Base LT = 1 wk. Beg. Inv. 1 2 3 4 5 6 7 8 Gross requirements Scheduled receipts Projected on hand Net requirements Planned order receipts Planned order releases

 Item: Motor LT = 2 wks. Beg. Inv. 1 2 3 4 5 6 7 8 Gross requirements Scheduled receipts Projected on hand Net requirements Planned order receipts Planned order releases

 Item: Body LT = 3 wks. Beg. Inv. 1 2 3 4 5 6 7 8 Gross requirements Scheduled receipts Projected on hand Net requirements Planned order receipts Planned order releases

 Item: Seats LT = 2 wks. Beg. Inv. 1 2 3 4 5 6 7 8 Gross requirements Scheduled receipts Projected on hand Net requirements Planned order receipts Planned order releases

 Item: Frame LT = 1 wk. Beg. Inv. 1 2 3 4 5 6 7 8 Gross requirements Scheduled receipts Projected on hand Net requirements Planned order receipts Planned order releases

 Item: Controls LT = 1 wk. Beg. Inv. 1 2 3 4 5 6 7 8 Gross requirements Scheduled receipts Projected on hand Net requirements Planned order receipts Planned order releases

 Item: Wheel Assemblies LT = 1 wk. Beg. Inv. 1 2 3 4 5 6 7 8 Gross requirements Scheduled receipts Projected on hand Net requirements Planned order receipts Planned order releases

Problem 12-15

 A company that manufactures paving material for driveways and parking lots expects the following demand for its product for the next four weeks:
 Week number 1 2 3 4 Material (tons) 40 80 60 70
 The company’s labor and machine standards and available capacities are as follows:
 Labor Machine Production standard (hours per ton) 4 3 Weekly production capacity (hours) 300 200
 a. Determine the capacity utilization for labor and machine for each of the four weeks. (Round your answers to 1 decimal place. Omit the “%” sign in your response.)
 Week Capacity Utilization for Labor Capacity Utilization for Machine 1 % % 2 % % 3 % % 4 % %