# Operations management 21-10,11,18 materials requirement planning

Problem 21-11

 Assume that Product Z is made of two units of A and four units of B. A is made of three units of C and three of D. D is made of three units of E. Lead times for purchase or fabrication of each unit to final assembly are: Z takes two weeks; A, B, C, and D take one week each; and E takes three weeks. Seventy units OF Product Z are required in Period 10. (Assume that there is currently no inventory on hand of any of these items.)

b.

Develop an MRP planning schedule showing gross and net requirements and order release and order receipt dates. (Leave no cells blank – be certain to enter “0” wherever required.)

Problem 21-18

 Product A is an end item and is made from three units of B and four of C. B is made of three units of D and two of E. C is made of three units of F and two of E. A has a lead time of one week. B, C, and E have lead times of two weeks, and D and F have lead times of three weeks.

 b. If 90 units of A are required in Week 10, develop the MRP planning schedule, specifying when items are to be ordered and received. There are currently no units of inventory on hand. (Leave no cells blank – be certain to enter “0” wherever required.)

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