Q$\mathrm{.}11$ A small marketing project consists of number of activities. Normal time $($in days$),$ a minimum or

crash time $($in days$)$ and the cost $($in Rs$.$ per day$)$ of crashing each activity is as follows:

You are required to

a$.$ Find out the normal project length and the minimum project length.

b$.$ Determine the minimum crashing cost of schedules ranging from normal length down to$,$ and

including the minimum length schedule, i$.$e$.,$ if $L$ is the length of the normal schedule, find the cost of

schedules which are $L,L-1,L-2,$ and so on days long. If overhead cost total is Rs$\mathrm{.}60$ per day, what

is the optimal length schedule duration on each activity for optimal solution