15 increased by 20% = 18
15 increased by 20 percent is 18. Step-by-step solution with the formula and worked example.
15 increased by 20% = 18
increased by %
Solution: 15 increased by 20 percent
Increase = 20% × 15 = 3
Result = 15 + 3 = 18
Result = 15 + 3 = 18
Step-by-step explanation
- Find the increase: 20% of 15 = 3.
- Add it to the original: 15 + 3 = 18.
- Shortcut: multiply by (1 + 20/100) = ×1.2.
Good to know
Shortcut: increasing by 20% is the same as multiplying by 1.2 (that is 100% + 20%). So 15 × 1.2 = 18 in a single step — handy for adding tax, interest or a markup.
Frequently asked questions
15 increased by 20 percent
15 increased by 20% = 18.
How is it calculated?
See the step-by-step solution above — it uses the standard percentage formula.
Calculated instantly in your browser. Try your own numbers in the box above, or use the full Percentage Calculator.