What is X% of Y?
What is % of =
X is what % of Y?
is what % of =
Percentage change
From to =
Increase / decrease by %
by % =
Formulas
- X% of Y = X ÷ 100 × Y
- X is what % of Y = X ÷ Y × 100 (handy for exam marks)
- % change = (B − A) ÷ A × 100
- Increase by X% = Y × (1 + X ÷ 100); decrease = Y × (1 − X ÷ 100) — use it for discounts and price rises
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