https://www.mathsisfun.com/percentage.html 13. Percentages: You are working on the checkout of a small retail business that does not have a checkout till. You will aj need to use a calculator to work out what change you need to give the customer in each of the following situations: a. The items each are worth: $ 15, $ 14.50, $ 16.50. The customer has a 10% off coupon. The customer gives you a so $ 50 note, what change do you need to give the customer? Show your working for the total amount and the change, that is, what steps did you take to reach your answer