Question

after the first night weeks, Corey's average in math was a 96. Last 9 weeks, his average dropped to a 91. find a percent of change

Answer 1

The percentage change in Corey's average in math is -5.21%

Here, we want to get the percentage of change

Mathematically, we can use the formula below;

$\frac{new\text{ value - old value}}{\text{old value}}\text{ }\times100$

From the question, the new value is 91, while the old value is 96

Substituting these values in the equation above, we have;

$\begin{gathered} \frac{91-96}{96}\times100 \\ \\ =\text{ }\frac{-5}{96}\times100 \\ =\text{ -5.21} \end{gathered}$