1. Suppose there are 4 supply points and 10 demand points. The per unit cost to ship from supply point to demand point is in the matrix below:

From/To	DP1	DP2	DP3	DP4	DP5	DP6	DP7	DP8	DP9	DP10	Capacity
Plant A	60	70	55	80	90	50	75	90	110	60	300
Plant B	90	100	70	70	80	90	95	65	70	90	300
Plant C	70	80	80	90	60	60	70	95	95	100	300
Plant D	100	75	100	100	75	80	100	100	80	80	200
Demand	100	120	160	100	90	80	110	140	85	95	X

1) Which plant should serve which demand points?

2) What is the lowest cost?

3) How much is it worth to add capacity to Plant A?