10 is 12.5% of 80.
So, if you are buying something that costs $80.00 and it is 12.5% off, you will pay $70.00 and save $10.
Tip! If you want to know what percent A is of B, you simply divide A by B, then take that number and move the decimal place two spaces to the right. That's your percentage!
Using the above numbers as example: 10/80 = 0.125.
Moving the decimal place two spaces to the right, you'll get: 12.5.
Use this 3-way Percent Calculator to easily find answers to simple percentage problems.
Learn Tricks and Tips for Doing Math in Your Head, featured at Education.cu-portland.edu.