7. (15 pts.) A contractor has orders to build five houses. The contractor has a reputation for excellence, so the customers will wait as long as necessary for their houses. The revenue to the contractor (in multiples of $1000) and time (in days) to build each house is: House Cost Time 1 145 15 2. 290 20 3 910 40 4 1150 45 5 2000 100 Assuming they can only work on one house at a time, what would be an appropriate measure to schedule building the houses? Using this measure, what schedule should the contractor use