Questions #3 starting on the first page 21

Assume the network and data that follow. Compute the total direct cost for each project duration. If the indirect costs for each project duration are $ 400 (19 time units), $ 350 (18), $ 300 (17), and $ 250 (16), compute the total project cost for each duration. Plot the total direct, indirect, and project costs for each of these durations on a cost-time graph. What is the optimum cost-time schedule for the project? What is this cost?