The president of Hill Enterprises, Terri Hill, projects the firm's aggregate demand requirements over the next $8$ months as follows:

$\backslash$table$[[$January$,1,400,$May,$2,300],[$February$,1,700,$June,$2,200],[$March$,1,600,$July,$1,900],[$April$,1,800,$August,$1,500]]$

per month Ignore any idle$-$time costs. The plan is called plan B limited to $900$ units per month. Evaluate this plan by computing the costs for January through August

In order to arrive at the costs, first compute the ending inventory and subcontracting units for each month by filling in the table below $($enter your responses as whole numbers$).$

$\backslash$table$[[$Period$,$Month,Demand,Production,$\backslash$table$[[$Ending$],[$Inventory$]],\backslash$table$[[$Subcontract$],[$Units$]]],[0,$December,,$1,400,1,400,],[1,$January,$1,400,,,],[2,$February,$1,700,1,400,,],[3,$March,$1,600,1,400,,],[4,$April,$1,800,1,400,-,$