The setup cost for the valve casing assembly is $$132,$ and the holding cost is h $=$ $$0\mathrm{.}60$ per assembly per week.

Determine the lot sizing for the $10$ periods using the following methods.

a$.$ Silver$$Meal$.$

b$.$ Least unit cost $($see Appendix $9$A$).$

c$.$ Part$-$period balancing $($see Appendix $9$A$).$

d$.$ Which lot$-$sizing method resulted in the lowest cost for the $10$ periods?