Question

The following graph shows the relation between number of CD sold and the cost of the CD. Find the unit rate.

• A. 0.33 dollars
• B. 0.3 dollars
• C. 0.225 dollars
• D. 0.40 dollars

Answer 1

The correct option is C 0.225 dollars

The unit rate is the slope of the line.

From the given graph, two points on the line are (4,0.9) and (8,1.8).

$\text{Slope (m) =}\frac{Rise}{Run}$

$=\frac{1.8-0.9}{8-4}$

$=\frac{0.8}{4}$

$=0.225$

Hence, Unit rate = Slope = 0.225 dollar