18 During the next three quarters, Airco faces the following demands for air conditioner compressors: quarter 1—200;

quarter 2—300; quarter 3—100. As many as 240 air compressors can be produced during each quarter. Production costs/compressor during each quarter are given in Table 78.

The cost of holding an air compressor in inventory is

$100/quarter. Demand may be backlogged (as long as it is met by the end of quarter 3) at a cost of $60/compressor/quarter.

Formulate the tableau for a balanced transportation problem whose solution tells Airco how to minimize the total cost of meeting the demands for quarters 1–3.