Solution: The introduced variable indicates the time taken by i(i= 1, 2,3,4,5) equipment to complete the product of i(j= 1, 2,3), and indicates the completion of i(i- 1.2.3.4.5) equipment. When i(i= 1, 2, 3, 4.5) equipment is available, f(i) represents the equipment cost when i(i= 1, 2, 3, 4, 5) equipment is fully loaded.

Objective function, maximum profit Max=* (()) Constraint: =