Chapter CSB, Problem 1.22E

To determine

To write: an equation related her earning to the number of hours. Also, the amount earned by Amanda for 2 hours and 4.5 hours.

Answer to Problem 1.22E

  $1\text{hrs}=\text{\$}\frac{m}{h};\$19;\$42.75$ .

Explanation of Solution

Given:

Total earning by Amanda for 3 hours is $\$28.50$ .

Calculation:

Total earning by Amanda for 3 hours is $\$28.50$ .

Write the equation that earning m to the number of hour h . Therefore, the required equation is

  $\begin{array}{l}h\text{hrs}=\text{\$}m\\ \therefore 1\text{hrs}=\text{\$}\frac{m}{h}\end{array}$ .

As the total earning by Amanda for 3 hours is $\$28.50$ .

Therefore, Amanda earned by per hour is:

  $\begin{array}{l}\because 3hrs=\$28.50\\ \therefore 1hrs=\frac{\$28.50}{3}=\$9.50\\ \therefore 2hrs=\$9.50\times 2=\$19\\ \therefore 4.5hrs=\$9.50\times 4.5=\$42.75\end{array}$

Hence, the required equation is $1\text{hrs}=\text{\$}\frac{m}{h}$ and the earning foe 2 hours and 4 hours respectively is $\$19;\$42.75$ .