The cost of producing each dialysis unit is $\backslash (\backslash$$ $985\backslash )$ on regular time, $\backslash (\backslash$$ $1,310\backslash )$ on overtime, and $\backslash (\backslash$$ $1,500\backslash )$ on a subcontract. Inventory carrying cost is $\backslash (\backslash$$ $100\backslash )$ 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 $\backslash (\backslash$Im $\backslash )($enter your response as a whole number$).$