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Q: A stationery vendor buys pencils at the rate of 21 pencils for ` 20 and sells them at the rate of 20 pencils for ` 21. His profit percent is about:
  • A. 20%
  • B. 5%
  • C. 10%
  • D. 15%
Correct Answer: Option C -
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Explanations:

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