The difference between the com-pound interest and simple interest on a sum of Rs. 18000 at the same rate of interest for 2 years is Rs. 405. What is the rate of interest per cent per annum?

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The difference between the com-pound interest and simple interest on a sum of Rs. 18000 at the same rate of interest for 2 years is Rs. 405. What is the rate of interest per cent per annum?