A shipping company ShipCo supplies four destinations
(D1,D2,D3,D4) from four sources (S1,S2,S3,S4). The shipping cost
(in dollars) per shipment from each source to each destination is
given below.
D1
D2
D3
D4
S1
7
8
5
2
S2
2
9
1
4
S3
4
5
3
1
S4
2
1
4
3
The four sources make 10, 20, 20, and 10 shipments per month,
respectively. The four destinations need to receive 20, 10, 10, and
20 shipments per month, respectively....