Example: Table shows a contractor's project's activities along with starting and finishing time and the budgeted cost. The conditions of contract allow measurements to be made monthly and payment of the amount certified less $5\%$ retention to be paid to the contractor after a month. Retention money is to be released after $6$ months of completion. Annual interest rate is $15\%$ on locked$-$up capital. Calculate the total profit of the contractor if he earns $10\%$ profit on quoted cost.

$\backslash$table$[[$Activity$,$Starting month,Duration $($month$),$Cost$/$month$],[$F$,5,1,200000],[$E$,3\mathrm{.}5,1\mathrm{.}5,40000],[$D$,3,1,150000],[$C$,3,1\mathrm{.}5,120000],[$B$,1,3,40000],[$A$,0,2,45000]]$