Please answer the questions and tables fully A$.$ B$.$ and C$.$ Recently, Phil Harris, the production control manager at Brunswick, read an article on time$-$phased requirements planning. He was

curlous about how this technique might work in scheduling Brunswick's engine assembly operations and decided to prepare an

example to Illustrate the use of time$-$phased requirements planning.

Phil's first step was to prepare a master schedule for one of the engine types produced by Brunswick: the Model $1000$ engine. This

schedule indicates the number of units of the Model $1000$ engine to be assembled each week during the last $12$ weeks and is shown

on the next page. Next, Phil decided to simplify his requirements planning example by considering only two of the many components

that are needed to complete the assembly of the Model $1000$ engine. These two components, the gear box and the input shaft, are

shown in the product structure diagram shown below. Phil noted that the gear box is assembled by the Subassembly Department and

subsequently is sent to the main engine assembly line. The input shaft is one of several component parts manufactured by Brunswick

that are needed to produce a gear box subassembly. Thus, levels $0,1,$ and $2$ are included in the product structure diagram to indicate

the three manufacturing stages that are involved in producing an engine: the Engine Assembly Department, the Subassembly

Department, and the Machine Shop.

The manufacturing lead times required to produce the gear box and input shaft components are also indicated in the bill$-$of$-$materials

diagram. Note that two weeks are required to produce a batch of gear boxes and that all the gear boxes must be delivered to the

assembly$-$line parts stockroom before Monday morning of the week in which they are to be used. Likewise, it takes three weeks to

produce a lot of input shafts, and all the shafts needed for the production of gear boxes in a given week must be delivered to the

Subassembly Department stockroom before Monday morning of that week.

In preparing the MRP example, Phil planned to use the worksheets shown the below and to make the following assumptions:

Twenty$-$five gear boxes are on hand at the beginning of Week $1,$ and seven gear boxes are currently on order to be delivered at the

start of Week $2.$

Fifty input shafts are on hand at the start of Week $1,$ and $26$ are scheduled for delivery at the beginning of Week $2.$ a$.$ Initially, assume that Phil wants to minimize his inventory requirements. Assume that each order will be only for what is required for

a single perlod. Calculate the net requirements and planned order releases for the gear boxes and input shafts. Assume that lot

sizing is done using lot$-$for$-$lot.

Gear Box Requirements

Answer is complete and correct.

Input Shaft Requirements

Answer is complete and correct. Phil would like to consider the costs that his accountants are currently using for Inventory carrying and setup for the gear boxes and

input shafts. These costs are as follows:

PART SOSTup $=$ $$100/$order Inventory carrying cost $=$

Gear Box $$2/$unit$/$week

Setup $=$ $$50/$order Inventory carrying cost $=$

Input Shaft

$$1/$unit$/$week

Calculate a better schedule by reducing the number of orders and carrying some inventory. Specifically, plan to recelve orders for

gear boxes only in weeks $3,6$ and $10.$

Gear Box Requirements

Answer is complete but not entirely correct.

Input Shaft Requirements

Answer is complete but not entirely correct. c$.$ What are the cost savings with this new schedule.

Cost of the schedule from part $($a$)$

Answer is complete but not entirely correct.

Cost of the schedule you developed in part b$.$

Answer is complete but not entirely correct.

Savings with the new schedule.

Answer is complete but not entirely correct.