His hourly rate is $13.75
Here, we want to get Piper's hourly pay at work
Let the hourly rate be h
Thus, for working 20 hours, the amount for this will be; 20 * h = 20h
Now, out of the $1500 sales, he is entitled to 16%
That means;
![(16)/(100)*\text{ 1500 = 240}](https://img.qammunity.org/2023/formulas/mathematics/college/b590tc0tldz8wp1320pwqekg9mss0nzurp.png)
Thus, we have it that;
![\begin{gathered} 20h\text{ + 240 = 515} \\ 20h\text{ = 515-240} \\ 20h\text{ = 275} \\ h\text{ = }(275)/(20) \\ h\text{ = \$13.75} \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/3hgt2ohgqqwz9s6kohtrk69r8pgw1q922t.png)