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:

$$ ?

Capacity Source

Month $1$

Month $2$

Month $3$

Month $4$

Labor

$$ Regular time

$245$

$275$

$300$

$300$

$$ Overtime

$15$

$24$

$26$

$18$

Subcontract

$14$

$17$

$18$

$15$

Demand

$260$

$316$

$336$

$301$

?

The cost of producing each dialysis unit is $?$ $ $875$ ?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.

Part $2$

Minimizing cost using the transportation $?$ ?method, the optimal cost is $?$ $enter your response here $?($