Percent increase, decrease, and reverse percent
Ratios, rates, units, and percentages · Stage 2
Recognize the pattern
A 20% decrease leaves 80% of the original amount.
Useful rulenew=old(1±r)
Build on: PSD-01
Try it before reading the solution
A $50 item is discounted by 20%. What is the sale price?
This teaching example is original and is not an official SAT question.
Reasoning
50 × (1−0.20)=50×0.8=40.
Answer$40
03 · Next step
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Practice questions remain in English, as on the SAT.