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Question
A sum of money at a certain rate per annum of simple interest doubles in the 5 years and at a different rate becomes three times in 12 years. The lower rate of interest per annum is = ?
Options:
A .  15%
B .  20%
C .  $${\text{15}}\frac{3}{4}$$ %
D .  $$16\frac{2}{3}$$ %
Answer: Option D

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