# Chapter 3 - Cumulative Review Exercises - Page 516: 20

The required value is $\$12\text{ per hour}$. #### Work Step by Step Let us assume$x$is the normal salary per hour. After$40$hours, the salary per hour is:$\begin{align} & =x+\frac{x}{2} \\ & =\frac{3x}{2} \\ \end{align}$We have earned$\$660$ for $50$ hours of work. So, salary until 40 hours is $=40x$ After $40$ hours, for the remaining $10$ hours the salary is \begin{align} & =10\times \frac{3x}{2} \\ & =15x \end{align} Thus, the total salary is: \begin{align} & 40x+15x=660 \\ & 55x=660 \\ & x=12 \end{align}

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