Answer:
33.33%
Explanation:
The computation of the percentage increase in the number of car washed is as follows;
= (Number of cars washed in next weekend - number of cars washed in one weekend) ÷ (number of cars washed in one weekend)
= (112 cars - 84 cars) ÷ (84 cars)
= 28 cars ÷ 84 cars
= 33.33%