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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 :
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Explanation:
Note:Principal will be same so equate principal
Interest in 3 years =3units
Interest in 3 years =3\3=1units
Required Rate(in Rate)=1\20×100=5%