With a given rate of simple Interest, the ratio of Principal and Amount for a certain period of time is 4:5 After six years, with the same rate of interest, the ratio of the Pricipal and Amount becomes 5:7 The rate of interest is ?



[ A ]    5%
[ B ]    2.5% right
[ C ]    4%
[ D ]    10%
Answer : Option B
Explanation :

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