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Question
In what time will Rs.72 become Rs.81 at 6$1/4$% per annum simple interest ?
Options:
A .  3 years
B .  2 years
C .  None of these
D .  2 years 6 months
Answer: Option B
Answer: (b)Using Rule 1,Interest = Rs.(81–72)= Rs.9Let the time be t years.Then, 9 = ${72 × 25 × t}/{4 × 100}$t = ${9 × 400}/{72 × 25}$ = 2 years.

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