15 Here is a network with the activity times shown in days: B(3) D(5) F(4) (A(7) G(5) C(4) E(2) a. Find the critical path. b. The following table shows the normal times and the crash times, along with the associated costs for each activity ACTIVITY CRASH TIME NORMAL TIME 7 A B 3 4 5 2 4. 5 NWNO NORMAL COST $7.000 5,000 9,000 3,000 2.000 4,000 5,000 CRASH COST $ 8,000 7,000 10,200 4,500 3,000 7,000 8,000 4 If the project is to be shortened by four days, show which activities, in order of reduction, would be shortened and the resulting cost