Practical Question:(5 Marks) PipeDream Supplies is a wholesaler of a large variety of pipes and other plumbing needs. The company's accountant, Bobbi Esbend, has recently completed a cost study of the firm's shipping department in which she used the weight of supplies loaded or unloaded at the company's loading dock to quantify the department's activity. Bobbi compiled the following data. Required: a) what is the cost driver? b) Calculate Variable cost per unit (slop). (Show all workings) c) Calculate Fixed cost (Intercept) .(Show all workings) d) What is the cost function