How it works
new = value × (1 + percent ÷ 100)amount added = value × percent ÷ 100
- value
- the number you start with
- percent
- how much to add on
- new
- the value after the increase
This is how markups, tips and raises work: a 20% raise on a $50,000 salary multiplies by 1.20 to give $60,000.
Frequently asked questions
What is 80 increased by 25%?
100. The increase adds 20 to the 80.
How do I add a percentage to a number?
Multiply the number by 1 plus the percent as a decimal. To add 15%, multiply by 1.15.
What is 200 plus 10%?
220.
How do I add a 20% tip to $50?
Multiply by 1.20 to get $60.