Harold had a summer lemonade stand where he sold small cups for $1.25 each and large cups for $2.50 each. He made $265. If Harold sold 88 small cups, find the number of large cups he sold.

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! )