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{ }*100`

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} (91-96)/(96)*100 \\ \\ =\text{ }(-5)/(96)*100 \\ =\text{ -5.21} \end{gathered}`