Multiple choice

In what time will Rs. $72$ become Rs. $81$ at $6\displaystyle\frac{1}{4}\%$ p.a. simple interest?

  1. $\;2$ years
  2. $\;3$ years
  3. $\;2$ years $6$ months
  4. $\;4$ years
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Interest = 81 - 72 = 9. Principal = 72. Rate = 6.25% = 25/4%. SI = (P * R * T) / 100. 9 = (72 * 25/4 * T) / 100. 9 = (18 * 25 * T) / 100. 9 = (450 * T) / 100. 9 = 4.5 * T. T = 2 years.

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