For a project with $4$ tasks, the tables below give associated progress details $($costs in thousands$),$ answer the following questions:

Budgeted Costs

$\backslash$table$[[,$Week$],[,$TBC$,1,2,3,4,5],[$Task I,so$,25,15,10,,],[$Task $2,80,25,40,15,,],[$Task $3,40,,,20,20,],[$Task $4,30,,,,15,15]]$

Actual Cost

$\backslash$table$[[,,$Week,,,$],[,1,2,3,4,5],[$Task $1,30,20,10,,],[$Task $2,25,45,20,,],[$Task $3,,,25,,],[$Task $4,,,,,]]$

Work Complete

$\backslash$table$[[,,,$Veek,$],[,1,2,3,4],[$Task $1,50,80,100,],[$Task $2,25,40,90,],[$Task $3,,,40,],[$Task $4,,,,]]$