A manufacturing firm produces diesel engines in four cities€”Hamilton, Oshawa, Oakville, and Windsor. The company is able to produce the following numbers of engines per month:

Plant                                              Production
1. Hamilton ......................................... 10
2. Oshawa .......................................... 20
3. Oakville .......................................... 15
4. Windsor .......................................... 25

Three trucking firms purchase the following numbers of engines for their plants in three cities:

Firm                                               Demand
A. Montreal ........................................ 10
B. Québec City .................................. 20
C. Peterborough ................................ 15

The transportation costs per engine ($100s) from sources to destinations are as shown:

However, the Québec City firm will not accept engines made in Oshawa, and the Peterborough firm will not accept engines from Windsor; therefore these routes are prohibited. Solve this problem.

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to from $7 $8 $5 1. 2. 6. 10 6. 3. 10 4. 3 9. 11