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The simple interest on a sum of money is 4/9th the principal, and the number of years is equal to the rate of interest

The simple interest on a sum of money is 4/9th the principal, and the number of years is equal to the rate of interest per annum. Find the rate of interest per annum. 1. 8% 2 6% 3. 6% 4. 9% 5. None of these

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