$[$B$]$ Jet skis and snowmobiles are assembled by Mobile Incorporated. Because both end$-$items use the same small engine, you can aggregate demand for the engine assembly. Develop an aggregate plan that uses a level production strategy each quarter. What is the total cost? Assume lost sales are backordered and filled during the next quarter. Summarize the plan, its costs, and consequences using manual computations.

$\backslash$table$[[$Initial Inventory Level,$1,000$ units$],[$Regular Time,$$15$