To add a percentage to a number, change the percentage to a decimal value, and add one to the value. Multiply the number by the result.
- Convert to a decimal value
Convert a percentage to a decimal value by dividing it by 100 or moving the decimal to the left two places. For example, 19 percent equals 0.19.
- Add one
Add one to the decimal number. For example, 0.19 + 1 = 1.19.
- Multiply by the result
Multiply the number by one plus the decimal value. For example, 250 x 1.19 = 297.5. This result means that 19 percent of 250 added to 250 equals 297.5.