You are the manager of World Wide Athlete, a chain of six sporting goods shops in your area. The shops sell 10 racing bikes per week at a retail price of $659.99. Recently, you put the bikes on sale at $599.99. At the sale price, 12 bikes were sold during the one week sale. (a) What was your markdown percent on the bikes? (Round your answer to one decimal place.) % (b) What is the percent increase in number