Chapter SR3, Problem 31P

Solution

The percent change when the temperature drops from $24°\text{F to }5°\text{F}$ .

  $79\%$

Given:

The temperature drops from $24°\text{F to }5°\text{F}$ .

Concept Used:

The percent change can be obtained by the quotient of the increase/decrease and the original amount multiplied by $100\%$ .

Calculation:

In order to find the percent change, note that the change of numbers is $24-5=19$ . So, divide this difference by the original number and multiply the quotient by $100\%$ and simplify further as shown below

  $\begin{array}{c}\text{Percent change}=\frac{19}{24}\times 100\%\\ =\frac{1900}{24}\%\\ =79.17\%\\ \approx 79\%\end{array}$

Thus, the percent change is about $79\%$ .