Increase a number by a percentage. Useful for price rises, salary hikes, markups, and anything that grows by a set percentage.
The percentage is applied to the original value to find the amount of the increase.
That amount is added back to the original value.
An increase of 100% doubles the number; an increase of 50% multiplies it by 1.5.
Increase amount: Value × Percent ÷ 100
Result: Value + Increase
A product priced at ₹200 goes up by 15%.
Original price: ₹200
Increase: 15%
Find the increase: 200 × 15 ÷ 100 = 30
Add it to the original: 200 + 30 = 230
Answer: ₹230 (an increase of ₹30)
How do I reverse a percentage increase?
Divide by (1 + percent/100) — do not just subtract the same percentage. A price that rose 15% to ₹230 was originally 230 ÷ 1.15 = ₹200. Subtracting 15% from ₹230 would wrongly give ₹195.50.
What is a 100% increase?
It means doubling. The value goes up by an amount equal to itself, so 200 becomes 400.
How do I apply two increases one after the other?
Multiply them, instead of adding them. Two 10% increases in a row give 1.10 × 1.10 = 1.21, which is a 21% increase overall, not 20%.