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With a given rate of simple interest, th...

With a given rate of simple interest, the ratio of principal and amount for a certain period of time 4:5. After 3 years, with the same rate of interest, the ratio of the principal and amont becomes 5:7. the rate of interest is:(दी गयी साधारण बियाज की किसी दर से किसी समयवधि के लिए मूलधन तथा मिश्रधन 4 : 5 के अनुपात में है 3 वर्ष के उपरांत उसी बियाज की दर से मूलधन से अनुपात 5 : 7 हो जाता है बियाज की दर क्या होगी )

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