Question 379957
From the given information there must be at least:

40 employee parking spaces for the department stores
110 employee parking spaces for the specialty stores
150 employee parking spaces in total
1350 public parking spaces

To minimize building costs, let all of the remaining parking spaces be public. Since there are at least 150 employee parking spaces we can assume that 1,850 public spaces will exist there. The cost will be (150)(600) + (1850)(580) = $1,163,000.

To maximize weekly revenue, we should still let all the remaining parking spaces be public, and use all 2,400. In this case the weekly revenue is (150)(100) + (2250)(1000) = $2,265,000.