The payment would be $198.01 and the total interest would be $1,880.75. Pretty straightforward with a financial calc. I can show you the keystrokes if you want, just message.
Are you looking for the unit price?
If so, you would divide 13.47 by 3.
This would give you $4.49 per yard.
18. You can do this in a calculator. 26 - 8 = 18. v = 18.