The simple interest on a certain sum of money at the rate of 5% p.a. for four years is `420. At what rate of interest, the same amount of interest can be received on the same sum after two and half year? [21st June 2019-IInd Shift]

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The simple interest on a certain sum of money at the rate of 5% p.a. for four years is `420. At what rate of interest, the same amount of interest can be received on the same sum after two and half year? [21st June 2019-IInd Shift]