$[$The following information applies to the questions displayed below.$]$

The Fashion Shoe Company operates a chain of women's shoe shops that carry many styles of shoes that are all sold at the same price. Sales personnel in the shops are paid a sales commission on each pair of shoes sold plus a small base salary.

The following data pertains to Shop $48$ and is typical of the company's many outlets:

$\backslash$table$[[,$Per Pair of Shoes$],[$Selling price,$$30\mathrm{.}00$