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Q: What is the ratio of the simple interest earned on a certain sum of money at 21% per annum for 8 years to that earned on the same sum at the same rate for 21 years?
  • A. 8:21
  • B. 21:5
  • C. 21:8
  • D. 5:21
Correct Answer: Option A -
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Explanations:

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