A construction contractor is responsible for a project with seven key tasks. Some of the tasks can begin at any time, but others have predecessor tasks that must be completed previously. The individual tasks can be carried out at standard times, or they can be expedited (crashed). The cost of executing the task increases by a certain cost per day if its time is shortened.If no crashing is done, how long will the project take and what will its cost be?b. Which activities should be crashed to achieve the least-cost schedule that meets a 40- day deadline? c. What is the difference between its cost and the cost in part (a)? please explain how to get the max cost with actauls and not just variables.