Relevant information for a project consisting of activities $A,B,$dots,$H$ is provided in the table below and the project network is provided.

$\backslash$table$[[$Activity$,$Time $($in Weeks$),$Cost,$\backslash$table$[[$Immediate$],[$Predessors$]]],[$Normal$,$Crash,Normal,Crash,$],[$A$,8,8,$$$950,$$$950,$NA$],[$B$,2,1,$$$1600,$$$1800,$A$],[$C$,5,3,$$$1950,$$$2130,$A$],[$D$,6,5,$$$1000,$$$1040,$B$,$ C$],[$E$,5,4,$$$750,$$$790,$B$,$ C$],[$F$,3,2,$$$1550,$$$1565,$D$],[$G$,4,2,$$$1700,$$$1734,$E$],[$H$,4,2,$$$1000,$$$1360,$F$,$ G$]]$

When all activities are completed in normal time, what is the project completion time?

To reduce project completion time by $1$ week at minimum cost, which activity, or activities should be crashed? Enter the letter for the activity $($or $($e$.$g$.\text{'}$B$\text{'},\text{'}$AH$\text{'}).$

What is the incremental cost to reduce project completion time by $1$ week at minimum cost?