Question
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?Solution
Overall interest(SI) = (12000×R×5)/100 = 7200 or R = 12% Using allegation method 
Money lent @ 10% = 2/(2+1) × 12000 = 2/3 × 12000 = Rs. 8000
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