Consider the project described in Problem 3 with the normal and the expedited costs and times given in the following table.

Immediate Normal Expedited Normal Expedited Activity Predecessor Time Time Cost Cost A — 3 2 $200 $250 B A 5 3 600 850 C A 1 1 100 100 D B, C 4 2 650 900 E B 3 2 450 500 F E, D 3 2 500 620 G F 2 1 500 600 H E, D 4 2 600 900

a. Consider successive reductions in the project time of one week and find the direct cost of the project after each reduction.

b. Suppose that indirect costs are $150 per week. Find the optimal project completion time and the optimal total project cost.