Two critical path activities are candidates for crashing on a CPM network. Activity details are in the table below. To cut two days from the project's duration, activity ________ should be crashed, adding ________ to the total project cost. $$\begin{array} { | c | c | c | c | c | }
\hline \text { Activity } & \text { Normal Time } & \text { Normal Cost } & \text { Crash Time } & \text { Crash Cost } \
\hline \mathrm { D } & 5 \text { days } & \$ 6,000 & 3 \text { days } & \$ 8,000 \
\hline \mathrm { E } & 8 \text { days } & \$ 4,000 & 4 \text { days } & \$ 6,000 \
\hline
\end{array}$$
A) D; $2,000
B) D; $1,000
C) E; $500
D) E; $1,000
E) E; $6,000

Question

Two critical path activities are candidates for crashing on a CPM network. Activity details are in the table below. To cut two days from the project's duration, activity ________ should be crashed, adding ________ to the total project cost. $$\begin{array} { | c | c | c | c | c | } 
\hline \text { Activity } & \text { Normal Time } & \text { Normal Cost } & \text { Crash Time } & \text { Crash Cost } \
\hline \mathrm { D } & 5 \text { days } & \$ 6,000 & 3 \text { days } & \$ 8,000 \
\hline \mathrm { E } & 8 \text { days } & \$ 4,000 & 4 \text { days } & \$ 6,000 \
\hline
\end{array}$$
A) D; $2,000
B) D; $1,000
C) E; $500
D) E; $1,000
E) E; $6,000

Quizplus · Accepted Answer

Crashing activity E from 8 days to 4 days reduces the project duration by 4 days, which is more than the required 2 days, and increases the cost by $2,000 ($6,000 - $4,000), not $1,000. However, since the question specifies cutting exactly two days, we need to adjust our approach. Crashing activity D from 5 days to 3 days cuts the duration by exactly 2 days and increases the cost by $2,000 ($8,000 - $6,000), which is not an option provided. Therefore, the correct answer must be based on the best available option related to the given choices, which is to crash activity E, but the cost increase provided in the options does not accurately reflect the data given. Given the discrepancy, the closest correct option based on the requirement to cut two days and the options provided is D) E; $1,000, acknowledging an error in the cost calculation based on the provided data.

Two Critical Path Activities Are Candidates for Crashing on a CPM