Last year, The tutoring center paid their tutors $40 per hour. This year, they payed them $46 per hour. What percent was the increase in pay?

In order to solve this problem begin with finding the difference between the initial value and final value. then once this value is known divide it by the original value to get a decimal. which gives you multiplying this value by 100% will give you your answer. %  

TLDR: the answer is 15%