Shipping Costs per unit Plant Customer

$123$

A $ $25$ $ $35$ $ $15$

B $ $20$ $ $30$ $ $40$

C $ $40$ $ $35$ $ $20$

D $ $15$ $ $20$ $ $25$

The firm needs to satisfy all demand each day, but would like to minimize the total costs.

The objective function for the firm's problem will have how many terms?