ii$)$

$\backslash$table$[[$Activity$,\backslash$table$[[$Normal duration$],[($weeks$)]],\backslash$table$[[$Normal cost$],[($Rs$)]],\backslash$table$[[$Crash duration$],[($weeks$)]],\backslash$table$[[$Crash cost$],[($Rs$)]]],[1-2,5,3000,2,10000],[2-3,6,4000,2,7000],[2-4,7,3500,4,5000],[3-4,5,5000,2,8000]]$

The project overhead costs are Rs $2500$ per week. Find the optimum duration and the cost associated with it$.$ Draw also the least cost network.