$\backslash$table$[[$Activity$,$Norm Time,Crash Time,Crash $$,$Normal $$,$Predecessors$],[$A$,3,2,45000,30000,],[$B$,8,5,210000,150000,$A$],[$C$,3,2,50000,40000,$B$],[$D$,5,3,70000,60000,$A$],[$E$,4,2,30000,25000,$B$],[$F$,2,1,27,000,18,000,],[$G$,3,2,28000,20000,$D$,$ E$],[$H$,3,2,21000,15000,$F$],[$I$,2,20000,20000,$G$,]]$

a$.$ What is the project length?

b$.$ What activities are on the critical path?

c$.$ What activity should be crashed first and what is the cost?

d$.$ What is the maximum that can be crashed from the project and what is the total cost?