What is the minimum cost of crashing the following project at Sawaya Robotics by $4$ days?

$\backslash$table$[[$ACTIVITY$,\backslash$table$[[$NORMAL$],[$TIME $($DAYS$)]],\backslash$table$[[$CRASH$],[$TIME $($DAYS$)]],\backslash$table$[[$NORMAL$],[$COST$]],\backslash$table$[[$CRASH$],[$COST$]],$IMMEDIATE PREDECESSOR$($S$)],[$Design $($A$),6,5,800,1,000,-],[$Wiring $($B$),7,6,200,350,-],[$Chip install $($C$),5,3,600,750,-],[$Software $($D$),5,3,900,1,250,$A$,$ B$],[$Testing $($E$),8,5,1,100,1,850,$C$]]$

The minimum cost of crashing the following project at Sawaya Robotics by $4$ days is $$,($enter your response as a whole number$).$