Industrial Engineering and Production Management
In CPM, the cost slope is determined by

Crash cost/Normal Cost
Normal Cost/Crash cost
(Crash Cost - Normal cost)/ (Normal time - Crash time)
(Normal cost - Crash cost)/ (Normal time - Crash time)

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Industrial Engineering and Production Management
The basic difference between PERT and CPM is that

PERT deals with events and CPM with activities
Critical path is determined in PERT only
Guessed times are used in PERT and evaluated times in CPM
Costs are considered on CPM only and not in PERT

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