Question

In order to improve her grade in math, Martha began spending more time on her math homework. Over a three-week period, Martha was able to change her grade from a seventy-five to an eighty-two. What is the percent change in Martha's grade over the three-week period?

Answer 1

To calculate the percent change in Martha's grade over the three-week period, you first calculate the difference between the two grades:

82 - 75 = 7

next, you calculate what is the associated percentage of 7 respect to 75, just as follow:

x = (7/75)(100)

x = 9.33

Hence, the percent change in Martha's grade was of 9.33%