The roll has 12.5 square feet of material.
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If you cut 1 inch for waste off the 16 inch width and 3 inches off the 100 foot (1200 inch ) length you have 3 x 171= 523 pieces
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.
29 inches
270 square feet.
Multiply the two dimensions to get the area. The calculation will give you 720 square inches.