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Practice Problems: Chapter 14, Material Requirements Planning (MRP) and ERP

Problem 1:

The Hunicut and Hallock Corporation makes two versions of the same basic file cabinet, the TOL (Top-of-the-line) five drawer file cabinet and the HQ (High-quality) five drawer filing cabinet.

The TOL and HQ use the same cabinet frame and locking mechanism. The drawer assemblies are different although both use the same drawer frame assembly. The drawer assemblies for the TOL cabinet use a sliding assembly that requires four bearings per side whereas the HQ sliding assembly requires only two bearings per side. (These bearings are identical for both cabinet types.) 100 TOL and 300 HQ file cabinets need to be assembled in week #10. No current stock exists.

Develop a material structure tree for the TOL and the HQ file cabinets.

Problem 2:

Develop a gross material requirements plan for the TOL and HQ cabinets in the previous example.

Problem 3:

Develop a net material requirements plan for the TOL and HQ file cabinets in the previous problems assuming a current on-hand finished goods inventory of 100 TOL cabinets. The lead times are given below.

Painting and final assembly of both HQ and TOL requires 2 weeks.

Both cabinet frames and lock assembly require 1 week for manufacturing.

Both drawer assemblies require 2 weeks for assembly.

Both sliding assemblies require 2 weeks for manufacturing.

Bearings require 2 week to arrive from the supplier.

Problem 4:

If the TOL file cabinet has a gross material requirements plan as shown below, no inventory, and 2 weeks lead time is required for assembly, what are the order release dates and lot sizes when lot sizing is determined using lot-for-lot? Use a holding cost of $2.00 and a setup cost of $20.00, and assume no initial inventory.

Gross Material Requirements Plan

Week 1 2 3 4 5 6 7 8 9 10

TOL 50 100 50 100

Problem 5:

If the TOL file cabinet has a gross material requirements plan as shown below, no inventory, and 2 weeks of lead time is required for assembly, what are the order release dates and lot sizes when lot sizing is determined by EOQ (Economic Order Quantity)? Use a holding cost of $2.00 and a setup cost of $20.00, and assume no initial inventory.

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