If the expression 11 length meant 11 inches, then we can solve the problem as follows.
total cost = (requirement x 12in/foot) ÷ unit length)) x unit price
the requirement is 95 feet, the unit cost is 12, therefore,
total cost = (95f x 12in/f) ÷ 11in/unit length )) x 12/unit
total cost = 103.6 x 12 = 1243.6
if the unit price is some value other than $12, then multiply by that unit price instead of 12.
