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

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

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Industrial Engineering and Production Management
The assumption in PERT is

Activities are fixed and can't be changed
Cost of project will always be more than the estimated cost, if no timely corrections are taken
A project can be subdivided into a set of predictable, independent activities
A project will always be behind schedule, if left uncorrected

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