On the first day of the semester, Shay scored a 60 on a math pre-test. On the last day of the same semester, Shay scored a 75 on the post-test. By what percent did Shay's score improve?
Shay's score improved by 25%.
To measure the percentage change you use the formula:
In this problem we are given the Old score (60) and the New score (75) which we can substitute into the formula and solve for