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 $6$ $ $1002$ $ $150$

B A E $8802140$

C B$,$ A F $240160$

D A F$,$ G $3802120$

E B G $5803140$

F C$,$ D G $5601100$

G E$,$ F$,$ D $61202160$

Draw the network and answer the following questions.