Multiple choice

What is the ratio of the simple interest earned by certain amount for 4 years and 7 years at the same rate of interest?

  1. $4 : 7$
  2. $3 : 7$
  3. $2 : 3$
  4. $5 : 7$

  5. None of these
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A Correct answer
Explanation

Simple interest is directly proportional to time when principal and rate are constant. For the same principal P and rate R, SI for 4 years = 4PR/100 and SI for 7 years = 7PR/100. The ratio SI(4 years):SI(7 years) = 4PR:7PR = 4:7. Time is the only variable.

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