Chapter 9.3, Problem 1GP

To determine

To calculate: The constant rate of change between the quantities in the table.

Answer to Problem 1GP

The constant rate of change is $\$2.40\text{ per item}$ .

Explanation of Solution

Given information:

The following table:

Calculation:

Find the unit rate to determine the constant rate of change.

  $\begin{array}{l}\frac{\text{Change in cost}}{\text{Change in number of items}}=\frac{\$(24-12)}{(10-5)\text{ items}}[\text{Substitute]}\\ =\frac{\$12}{5\text{ items}}[\text{Simplify]}\\ =\frac{\$2.40}{1\text{ item}}[\text{Write as unit rate]}\\ \end{array}$