Looking for the answer to Q3.

Problem 3.30 Three activities are candidates for crashing on a project network for a large computer installation (all are, of course, critical). Activity details are in the following table: Activity B Normal Time Crash Time (days) (days) 7 6 4 2 11 9 Normal Cost $4,500 $1,200 $4,000 Total Cost with Immediate Crashing Predecessor(s) $5,100 $3,000 A $6.200 B a) Activity that should be crashed first to reduce the project duration by 1 day is A b) Activity that should be crashed next to reduce the project duration by one additional day is B c) Total cost of crashing the project by 2 days = $ (Enter your response as an integer.)