Given the following data and network, find answer the questions $18-20$ if you're asked to finish this project $2$ days earlier than its normal duration. Indirect cost $($overhead$)$ is $$200$ per day.

$\backslash$table$[[$Activity$,$Dura,ation,C$,$ost,Duration,Cost,Crash Cost,,$],[,$Normal,Crash,Normal,Crash,Difference,Difference,per Day,Days Shorten,$],[$A$,1,,$$$800,$$$800,,,,,],[\frac{?}{\text{b}\text{a}\text{r}}(B),7,,$$$1,000,$$$1,600,,,,,],[C,6.,,$$$300,$$$500,,,,,],[\frac{?}{\text{b}\text{a}\text{r}}(D),3,,$$$400,$$$800,,,,,],[\frac{?}{\text{b}\text{a}\text{r}}(E),3,,$$$100,$$$200,,,,,],[F,7,,$$$500,$$$800,,,,,],[G,8,,$$$1,200,$$$1,400,,,,,],[H,7,,$$$350,$$$600,,,,,],[1,5,,$$$700,$$$850,,,,,],[J,3,,$$$500,$$$1,000,,,,,],[$K$,5,,$$$450,$$$800,,,,,],[,,,,,$Days Cut,,,,$],[,,,,,$Project Dur,ation,,,$],[,,,,,$Increased c$,,,,],[,,,,,$Direct Cost,,,,$],[,,,,,$Overhead C$,$ost,,,$],[,,,,,$Total Cost,,,,$]]$