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?

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Answer 1 · 2016-11-28T18:13:12

Shay's score improved by 25%.

To measure the percentage change you use the formula:

#p = (N - O)/O * 100# where #p# is the percentage change, #N# is the new value and #O# is the old value.

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 #p#:

#p = (75 - 60)/60*100#

#p = 15/60*100#

#p = 1500/60#

#p = 25#