Correct Answer was written on textbook and (a) $33.39 (b) 53.1% (c) 58.3%. However, I don't know how to caluculate them. Please show your work based on these correct answer.

37. For a Spring Sale event, a buyer plans to purchase 250 floral print dresses to retail for $79.99 each. A 56% markup is needed on the total purchase. From one of the buyer's best resources, 110 dresses were purchased that cost $37.50 each. The buyer knows, however, that the costs will have to be averaged on the balance of other purchases from alternate resources in order to achieve a 56% markup on the entire group. a. What must be the average cost per dress on the balance of the pur- chases if the buyer is to attain the planned markup percentage? b. What markup percentage did the buyer attain on the first purchase of 110 dresses? c. What markup percentage did the buyer have to get on the balance of the purchases to realize the overall needed markup