Van and Mourik (known as VAM) are a manufacturer of designer up-market business shirts. To maintain the exclusivity of their brand name VAM only sell their shirts to four retail stores located in Carlton, Chadstone, Toorak, and South Yarra. The list selling price per business shirt is $200 and the average cost per business shirt is $110. VAM has recently appointed a new accountant, Greg, who decided that it would be a good idea to evaluate the profitability of each of VAM's four customers. Greg has collected the following information for 2016: Required a. Calculate the profitability for each of VAM's four customers