My problem says blank is what percent of $80 = $20

Yo y do yall have 2 stars that means yall wrong bro

Determine the solution for mc001-1.jpeg

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! )