Mary sells T-shirts in a stall at the shopping centre. When she charges 15 per T-shirt she does not sell anything, however she noticed that every time she reduces the selling prince by 1, sells 15 more t-shirts per hour. A T-shirt cost 4.50 to make and she is charged 130 a day for her stall. Mary opens her stall from 10am to 8pm a. Write the equation to calculate the maximum profit b. Using the equation write in a table the price and profit for price ranging from 15 to 3 c. Plot a graph and draw a diagram to represent the profit d. What is the maximum possible profit? What should be the selling price to achieve it?