Question

Three activities implementable in parallel, have the following time-cost relationships for direct cost component in each:
Activity A:
10 days-800 units; 9 days-900 units;
8 days-1000 units

Activity B:
11 days-1200 units; 10 days-1350 units;
9 days-1500 units

Activity C:
7 days-500 units; 6 days-700 units;
5 days-900 units
The feasible range of total direct cost component for the three activities together is

• A. 2500 to 2900 units
• B. 2650 to 3200 units
• C. 2600 to 3100 units
• D. 2500 to 3400 units

Answer 1

The correct option is D 2500 to 3400 units

The minimum cost for normal duration of all activities= 800+1200+500 = 2500 units.
The maximum cost for crash duration of all activities = 1000 +1500 +900 = 3400 units.