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SAT Math Practice Exam

Category - Mathematics - Hard

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If 36 is 30 percent of 30 percent of a certain number, what is the number?

Explanation

Answer: D- Assume the original number is 100. Its 30% is 30. Again 30% of 30 are 9. Thus 9 are 30 percent of 30 percent of 100. Hence 36 are 30 percent of 30 percent of 400.
Key takeaway: In such percent problem, do not add percents. For example 30% of 30% is not 60%. It is 9%.

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