Given the data and information that follow, compute the total direct cost for each project duration. If the indirect costs for each project duration are $90 (15 time units), $70 (14), $50 (13), \$40 (12), and $30(11), compute the total project cost for each duration. What is the optimum cost-time schedule for the project? What is this cost? Exercise 4 (a) (b) (c) \begin{tabular}{l|r|r|r|r|r|} PROJECT DURATION & 15 & 14 & 13 & 12 & 11 \\ \hline TOT. DIRECT COST & & & & & \\ TOT. INDIRECT COST & 90 & 70 & 50 & 40 & 30 \\ TOTAL COSTS & & & & & \\ \hline \end{tabular}