Question content area

Part $1$

Three activities are candidates for crashing on a project network for a large computer installation$($all are, of$$ course, critical$).$ Activity details are in the following$$ table:

$$

Activity

Normal Time$($days$)$

Crash Time$($days$)$

Normal Cost

Total Cost with Crashing

Immediate$$ Predecessor$($s$)$

A

$77$

$66$

$ $5$ comma $000$$$5,000$

$ $5$ comma $400$$$5,400$

long dash$$

B

$44$

$22$

$ $1$ comma $400$$$1,400$

$ $3$ comma $100$$$3,100$

A

C

$1111$

$99$

$ $4$ comma $000$$$4,000$

$ $6$ comma $000$$$6,000$

B

Part $2$

$$a$)$ Activity that should be crashed first to reduce the project duration by $1$ day is

A

$.$

Part $3$

$$b$)$ Activity that should be crashed next to reduce the project duration by one additional day is

$$

A

B

C

$.$