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,$2,200],[$February$,1,600,$June,$2,200],[$March$,1,700,$July,$1,700],[$April$,1,800,$August,$1,300]]$

Ignore any idle$-$time costs. Evaluate the following plan.

This exercise contains only Plan $E$

Plan E$.$ Keep the current workforce, which is producing $1,600$ units per month, and subcontract to meet the rest of the demand Subcontract cost is $$80$ per unit.

The total subcontracting cost $=$$ $($Enter your response as a whole number.$)$