Find the sale price or original price.
28. Original price: $50
Discount: 15%
Sale price: ?
29. Original price:?
Discount: 20%
Sale price: $75
30. What is the original price of the tennis racquet?
31. A store pays $50 for a pair of shoes. The markup is 25%.
a. What is the selling price for the shoes?
b. What is the total cost for a person to buy the shoes
including a 6% sales tax?