Problem Solving & Data AnalysisEasy
Percentages
Calculate percent change, percent of a total, and work with successive percentage changes.
Sample SAT Problem
A jacket costs $80. After a 15% discount, what is the sale price?
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Step-by-Step Solution
Discount = 0.15 × 80 = $12. Sale price = 80 − 12 = $68.
Key Tips from Pamela
- Percent change = (new − old) / old × 100.
- For successive changes, multiply the multipliers: 20% up then 20% down is 0.96×, not 1×.
- "What percent of" means divide and multiply by 100.
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