.799
For dividing by ten, just move the decimal point forward one.
799 - 79.9 = 719.1
79.9
10 percent off 129 is 12.9.
10 percent off 27.99 is 2.80.
10 percent off 139.99 is 14.
10 percent off of 127.40 is 12.74.
10 percent off 87.99 is 8.80.
10 percent off of 35.99 is 3.60.
10 percent off of 230 is 23.
10 percent off 325 = 292.5
10 percent off of 189.00 is 18.90.
10 percent off is 10% discount from the price of something. 10% is 0.10 in decimal.