Sorry, this is not a Mathematics term.
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A 1 foot roll will remain 1 foot even when rolled up. The diameter of the roll will depend on the thickness of the material.
Yes - a foot is a linear foot. They mostly use the term linear foot when you might confuse the meaning with square feet. For example a roll of carpeting might be sold by the linear foot .
If the vinyl is 2 inches wide and you need the cost for 1 inch, it is half the cost - and that is 57.00/2 = 28.50
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.
The cheapest single roll of wallpaper is around 25 dollars. A single roll of wallpaper is 27 square feet. 25 divided by 27= .92 aproximately.