Rolf's Golf store sells golf balls for $28 per dozen. The store's overhead expenses are 25% of cost and the owners require a profit of 21% of cost. a. How much does Rolf's Golf store buy the golf balls for? b. What is the price needed to cover all the costs and expenses? c. What is the highest rate of markdown at which the store will still break even? d. What markdown rate would price the golf balls at cost?