2.18 Given the following project (all times are in days): Activity Predecessor Normal time Normal cost Crash time Crash cost A 3 $40 2 $80 B A 2 20 80 C A 2 20 2 20 D A 4 30 120 E B 3 10 80 a. How much will it cost to complete the project at a normal pace? b. What is the shortest amount of time the project can be completed in? What is the cost of completing the project in the shortest amount of time? c. Create a graph showing the time-cost trade-off. Based on the graph, how much would you recommend the project be crashed? 2.19 Given the following project (all times are in days)