please do 2.2

The activities involve in building a small drinking place in Soweto in weeks (W) and the associated costs in Rands (R) are listed below; Activity A B C D E F G H I 2.1 2.2 Normal Time (W) 3 2 3 7 6 2 4 8 6 Crush Time (W) 1 1 3 3 1 1 2 5 4 Normal Cost (R) 1 000 2 000 500 1 300 850 4 000 1.500 4 500 2 000 Crush Cost (R) 1 600 2 700 500 1 600 1 000 5 200 2 000 3 000 1 600 Immediate Predecessors A B C D, E D, E F, G Construct the network and determine the project completion time (06) What will be the total cost of crushing this project to ten (10) weeks in the most economical way? (14)