What activities are on the critical path (before you start crashing the project)?

A new supply ordering system needs to be installed as soon as possible. The table below lists the
project’s activities and their predecessors. Also provided is the cost information to reduce the standard
activity times.

Crash the project from 32 days to 28 days by 1 day increments and answer the following questions:
a) What activities are on the critical path (before you start crashing the project)?
b) To crash the project from 32 days to 31 days, which activity would you crash by one day?
c) To crash the project from 31 days to 30 days, which activity would you crash by one day?
d) To crash the project from 30 days to 29 days, which activity would you crash by one day?
e) To crash the project from 29 days to 28 days, which activity(s) would you crash by one day?
f) What is the total crashing cost to crash the project from 32 days to 28 days?

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