Question 3657
There are 3 feet in a yard.
So 10 feet is 10/3 yards and 12 feet is 12/3 = 4 yards.

To find how many square yards you need 10/3 x 4 = 20/3 square yards.

at 12.51 per square yard you get 20/3 * 12.51 = 83.40.

Of course in the real world this would not be accurate because they will make you pay for a full yard regardless and you end up scrap left over because if the room is 10 feet by 12 feet and the carpet comes in bolts 11 feet wide you would have to buy a 11 feet by 12 feet piece of carpet, and you would have to pay for labor, and glue, and padding, and etc... etc... etc...