Dear .. I am facing a problem understanding the following problem -- I have an idea the procedure but my confusion is that based on what do we determine the number of days to be shorten??? For example Activity B has been shorten to 2 days only while we can short it 3 days at one attempt --- please clear the steps and the solution so it become more useful and helpful

I do know the solution which is in the below table -- I am looking for EXPLIANTION

1. Determine the logical steps to reduce the following project to its shortest duration B 10 E 9 A 5 C 6 F 6 H 5 1 G D 8 9 Time Difference Cost Difference Slope S/Day Activity # A B C D E F G H Time Normal 5 10 6 8 9 6 9 5 Time Crash 5 7 4 6 5 5 7 4 Cost Normal $100 $500 $300 $400 $200 $100 $320 $410 Cost Crash $100 $500 $400 $600 $320 $140 $400 $500 Cycle # Cost Can be Days Per Shortened Nil Shortened Day Cost For Cycle Total Cost Project Duration 0 1 $40 $60 30 28 27 2 3 4 5 6 B 3 2 2 B. G 1 2 1 E. G 1 2 1 H 1 1 DE 2 2 2 The Schedule Is Now Fully Crashed $20 $60 $70 $90 $130 $70 $2330 $2370 $2430 $2500 $2590 $2850 NNN $90 $260 25 23