Assume the network and data that follow
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Exercise 9.3 – 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?

(Source: Gray & Larson, 2014, p.325).