Consider the following table that describes the total cost of producing dresses by Shirley, a local fashion artist. Dresses Total cost ($1 50 80 105 140 180 225 275 350 HOUI-bMl'O Assume that the market is competitive and the price of dresses is $73. At this price how many dresses should Shirley produce to maximise prot? {If Shirley is indifferent between producing an additional dress and not producing, please assume that she will produce the additional dress to break the tie.)