Jerusalem Medical Ltd$.,$ an Israeli producer of portable kidney dialysis units and other medical products, develops a $4-$month aggregate plan. Demand and capacity $($in units$)$ are forecast as follows:

The cost of producing each dialysis unit is $$985$ on regular time, $$1,310$ on overtime, and $$1,500$ on a subcontract. Inventory carrying cost is $$100$ per unit per month. There is to be no beginning or ending

inventory in stock and backorders are not permitted.

Minimizing cost using the transportation method, the optimal cost is $($enter your response as a whole number$).$