(CO 3) Bob is planning a large surprise party for her sister Gwendolyn. She has developed the following plan, including estimates of the time (in hours) and cost necessary to perform each of the tasks required.

Crash Immediate Planned Minimum Task . . Cost per Predecessor Duration Duration Hour A. Create Guest List 8 4 $27.50 B. Send Invitations A 2 1 $25.00 (3. Buy Decorations A 8 6 $35.00 D. Plan Menu A 3 2 $60.00 E. Purchase Food D 4 2 $37.50 F. Prepare Food E 5 3 $125.00