Please help : find x

How do you find principle and simple interest

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?

Suppose a store sells an average of 80 cases of soda per day. assume that each case contains 24 cans of soda and that the store is open 10 hours per day. find the average number of soda that the store sells per hour.