8students share 5 square pieces of cake equally

Acable car begins its trip by moving up a hill. as it moves up, it gains elevation at a constant rate of 50 feet/minute until it reaches the peak at 2,000 feet. then, as the car moves down to the hill’s base, its elevation drops at the same rate.

Tanyss's house has 25 windows. her brother has washed 22 of the windows. what percent of the windows has her brother washed?

What’s the answer? and how do i solve it ?