Three percentage tools in one: X% of Y, X as a percent of Y, and percentage increase or decrease.
Three types of percentage calculations in one tool
X% of Y = X ÷ 100 × Y, so 15% of 2,000 is 300. X is what percent of Y = X ÷ Y × 100, so 50 is 25% of 200. Percentage change = (new − old) ÷ old × 100, so a move from 80 to 100 is +25%. Handy for discounts, exam marks, profit margins and price changes.
Use it for discounts and sale prices, exam marks, profit margins, salary increments and price changes.
Percentage change = (new value − old value) ÷ old value × 100. For example, a rise from 80 to 100 is a 25% increase.
Use 'What is X% of Y' to find the discount amount, then subtract it from the original price.
It means the value decreased from the original. The result box labels it as a decrease.