Use a formula to find the amount of wrapping paper you need to wrap a gift in a cylindrical box shown. You need to cover the top, bottom, and all the way around the box. Use 3.14 for pi. The side is 5 in. And the bottom is 5 in.

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )