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Common Examples
Sales Tax
Calculate 8.5% sales tax on $120
Grade Percentage
85 out of 100 points = what %?
Discount
$50 item with 20% discount
Restaurant Tip
15% tip on $85 bill for 4 people
Percentage Formulas
Basic Percentage
Formula: (Percentage ÷ 100) × Value
Example: 15% of 200 = (15 ÷ 100) × 200 = 30
Percentage Of
Formula: (Part ÷ Whole) × 100
Example: 30 is what % of 200? = (30 ÷ 200) × 100 = 15%
Percentage Change
Formula: ((New - Old) ÷ Old) × 100
Example: From 100 to 120 = ((120 - 100) ÷ 100) × 100 = 20%
Tips & Discounts
Tip: Bill × (Tip% ÷ 100)
Discount: Price × (1 - Discount% ÷ 100)