Some amount out of Rs.12000 was lent out at 10% per annum and the rest amount @ 16% per annum and thus in 5 years the total interest from both the amount collected was Rs.7200. What is the amount which was lent out at 10% per annum?

Overall rate of interest = (12000×R×5)/100 = 7200 R = 12% Using allegation method, Money lent @ 10% = 2/3 × 12000 = Rs. 8000

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