P and Q started a business by investing Rs.9000 and Rs.7200 respectively. After 6 months, Q increased his investment by a certain percentage such that at the end of 1 year, the profit shares of P and Q were equal. By how much percentage did Q increased his investment?
Let the increased investment amount of Q = Rs.x Ratio of profit shares of P and Q = (9000 x 12) : (7200 x 6 + 6y) = 1:1 So, 108000 = 43200 + 6x => x = 10800 Increase in investment of Q = 10800 – 7200 = Rs.3600 Required % = (3600/7200) x 100 = 50%
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