a. if the cost of an item is $10.00 and the markup is $15.00, what is: 1. the markup % on cost? % 2. the markup % on selling? % b. if markup on selling is 25%, what is the markup on cost %? % c. if markup on cost is 25%, what is the markup on selling %? % d. if an item cost $12.00 and is to be sold at a 25% markup on selling, what is the selling price