# The cost of pens varies directly with the number of pens. One pen costs $2.00. How do you find k in the equation for the cost of pens, use C=kp, and how do you find the total cost of 12 pens?

Total cost of

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To find k in the equation C = kp, divide the cost (C) by the number of pens (p) for a given scenario. For example, if one pen costs $2.00, then k = C/p =$2.00/1 = $2.00.

To find the total cost of 12 pens, use the equation C = kp, where p = 12 (the number of pens) and k = $2.00 (the cost of one pen). Thus, C =$2.00 * 12 = $24.00. Therefore, the total cost of 12 pens is$24.00.

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