the mitchell family is renting a boat for the day. the boat rental has a flat fee of $100 plus $20 for each hour. they have to pay for a whole hour even if they are not out on the lake for a whole hour. for example, if they rent the boat for 3 and one-half hours, they have to pay for 4 hours.

if they want to spend $250 or less on the boat rental for the day, how many hours can they rent the boat? write an inequality and solve.