A farmer planted 60 potatoes in two garden plots, 120 potatoes in four garden plots, and 240 potatoes in eight garden plots. What is the constant rate of change?

The rate of change can be calculated below
[tex]\begin{gathered} \text{rate = }\frac{\text{ number of potatoes}}{\text{plots}} \\ \text{rate}=\frac{60}{2}=30\text{ potatoes per plot} \\ \text{rate}=\frac{120}{4}=30\text{ potatoes per plot} \\ \text{rate}=\frac{240}{8}=\text{ }30\text{ potatoes per plot} \end{gathered}[/tex]The answer is C. 30 potatoes per garden plot.