$1)$ What is the critical path, time, and cost for an all$-$normal level of project activity?

$2)$ Calculate the crash cost$-$per$-$day $($all activities may be partially crashed$).$

See column H in the table above

$3)$ Find the optimal way of getting an $18-$day delivery time.

Crash activities $1$ day at a time $($they can be partially crashed$).$

Project cost Critical activties

$4)$ Find the optimal way of getting a $16-$day delivery time. What is the project cost?

$($Crash cheapest activities that impact project time using the Gantt chart until you get $16$ days$)$