Chapter 9.8, Problem 41SR

To determine

To calculate: To find the percent of change in the number of students in the biology class.

Answer to Problem 41SR

The percent change in the number of students in the biology class is $14.3\%$

Explanation of Solution

Given information: A biology class had $28$ students and four students were transferred out of the class to take chemistry

Formula Used:

Formula for the percent of change is given as

  $\%Change=\frac{\left|NewValue-OldValue\right|}{OldValue}\times 100\%$

Calculation:

Given that biology class had $28$ students and four students were transferred out of the class to take chemistry

  $NewValue=28-4=24$

  $OldValue=28$

Thus, percent change in the number of students in the biology class is calculated as

  $\%Change=\frac{\left|24-28\right|}{28}\times 100\%$

On solving,

  $\begin{array}{l}\%Change=\frac{4}{28}\times 100\%\\ \%Change=\frac{1}{7}\times 100\%\\ \%Change=14.3\%\end{array}$

Conclusion:

Hence, percent change in the number of students in the biology class is $14.3\%$