QWERTY Computer Company is developing a weekly production schedule for one of its high$-$

running models. The indented BOM for this model is as follows:

All of the components are purchased from an outside vendor, but QWERTY performs assembly

operations for the motherboard, as well as the final assembly of the computer.

The forecasted weekly demands for this computer for weeks $6$ to $11$ are $220,165,180,120,75,$

and $300.$ The starting inventory of assembled computers in week $6$ is expected to be $75,$ and the

production manager anticipates returns of $30$ computers in week $8$ and $10$ computers in week $10.$

a$.$ Determine the schedule of purchase orders for the disk drives, assuming a lot$-$for$-$lot ordering

rule.

b$.$ Determine the planned order releases for the motherboards, assuming a lot$-$for$-$lot scheduling

rule.

c$.$ Determine the planned order releases for the motherboards using the EOQ lot$-$sizing rule, given

a setup cost of $$180$ and a holding cost of $$\frac{0\mathrm{.}40}{?}$ board$/$week$.$

d$.$ Using the results from part $c,$ determine the schedule of purchase orders for the DRAM chips

using the EOQ lot$-$sizing rule, given an order cost of $$25$ and a holding cost of

$$\frac{0\mathrm{.}01}{}\frac{p}{?}$ week.