$13\mathrm{.}7$ Consuelo Chua, Inc., is a disk drive manufacturer in need of an aggregate plan for July through December. The company has gathered the following data: $*$No costs are incurred for unmet demand, but unmet aemallu suounorders$)$ must be handled in the following period. If half or more of a worker is needed, round up$.*$ Note that there is no holding cost for June. What will each of the two following strategies cost? a$)$ Vary the workforce so that production meets demand. Chua had eight workers on board in June. b$)$ Vary overtime only and use a constant workforce of eight. $\_$K