What is the unit rate for Carl’s Colossal Cupcake?

A dashed line is shown in Quadrant I of the coordinate plane.The points left-parenthesis 0 comma 0 right-parenthesis, left-parenthesis 2 comma 5 right-parenthesis, and left-parenthesis 4 comma 10 right-parenthesis are marked with dots. The dashed line passes each of these three points and continues to the right. The horizontal axis is labeled Number of Cupcakes. The vertical axis is labeled Cost in dollars.

$2.50 for 1 cupcake

$5.00 for 2 cupcakes

$1.00 for two and one-half cupcakes

$5.00 for 1 cupcake

The unit rate for Carl's Colossal Cupcake is $2.50 per cupcake.