please a step by step approach will be appreciated

Using the sub-project from question 1 the following additional information is supplied regarding cost and duration. Please note that rounded numbers for Expected Time have been used to generate the normal duration values. You should round your figures for all the other activities that cannot be reduced in time (or crashed). The customer for this manufacturing cell in the customer suite has a contract in place for deliveries that includes penalty clauses. The overall project has lost time such that this sub-project is in danger of incurring these additional charges if it is not complete and ready. The penalty charge costs are 3000 /day for each day that the suite is late in producing the customer's order. Calculations have been undertaken that show that this sub-project must be completed in 24 days to avoid the penalties. a. Large scale spending on resources can shorten this project to or below this 24-day threshold. What is the shortest time that the sub-project can be completed but remain financially workable? [15 marks] b. Critically discuss the principle of crash costing and provide practical examples of how this can be applied to this sub project. You should also consider why some of the activities cannot be shortened. [10 marks]