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Question
With a given rate of simple interest, the ratio of principal and amount for a certain period of time is 4 : 5. After 3 years with the same rate of interest, the ratio of the principal and amount becomes 5 : 7. The rate of interest is = ?
Options:
A .  4%
B .  6%
C .  5%
D .  7%
Answer: Option C

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