Multiply the two dimensions to get the area. The calculation will give you 720 square inches.
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The roll has 12.5 square feet of material.
A roll 2 foot by 30 foot contains 60 square feet. There are 144 square inches in a square foot. So the roll contains 8630 square inches = and you get all of these for 30 units of currency. I will assume that the unit of currency contains 100 smaller units. so the price is 3000 small units. This means that the cost per sq inch = 3000/8630 = 0.347 small units = just slightly more than one-third of the small unit.
A roll of quarters contains 40 quarters, which equals $10. The height of a roll of quarters is approximately 1 inch. Therefore, there are about 1 inch in a standard roll of quarters.
2 x 10 x 36 = 720 square inches... 720 / 18 = 40 units !
29 inches