Construction of a building is based on the following CPM network: Activity Predecessor Successor Normal Time Normal Cost Crash Time Crash Cost A - B, C, D 6 $ 100 2 $ 150 B A E 8 80 2 140 C B, A F 2 40 1 60 D A F, G 3 80 2 120 E B G 5 80 3 140 F C, D G 5 60 1 100 G E, F, D - 6 120 2 160 Draw the network and answer the following questions. a. What are the normal project completion time and normal cost