Home > Pre-algebra > Percentages > Percentage Decrease
Caleb saw a book he wanted on Amazon for \$20. The next day he noticed that the price had dropped to \$10. By what percent did the price drop?
First, find the number of dollars the price decreased
To find what percentage 10 is of 20, we need to divide
Moving the decimal place two to the right and then putting a % sign at the end of the number we get: