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** Q 2454412354. ** Arun invested a sum of money at a certain rate of simple interest for a period of 4 yr. Had he invested the same sum for a period of 6 yr the total interest earned by him would have been fifty per cent more than the earlier interest amount. What was the ratio of interest per cent per annum?

**IPPB-PO 2017 Mains 2401**