Answer :

ANSWER:

$7.5 per box

STEP-BY-STEP EXPLANATION:

We must calculate the slope of the line to know the price of each card:

[tex]m=\frac{y_2-y_1}{x_2-x_1}[/tex]

Replacing the points (0, 0) and (4, 30):

[tex]m=\frac{30-0}{4-0}=\frac{30}{4}=7.5[/tex]

Which means that the cost per box is $7.5

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