A seven activity project has the activity durations (in weeks) and costs shown in the table. It is possible to speed up every one of the activities by paying a little more. What is the least expensive 30-week project?

Activity
Predecessor Normal Duration
Normal Cost Crash Duration
Crash Cost
A -- 7 $2000 5 $3000
B -- 8 $1500 6 $2000
C A 12 $2500 10 $2900
D B 13 $3000 10 $4200
E B 15 $4000 12 $5500
F C, E 10 $3200 8 $4000
G D 7 $1800 6 $2200

A) $18,900
B) $19,200
C) $19,500
D) $19,800

Answer: A