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ATQ, Ratio of profit shares of 'A' and 'B' at the end of the year = {(5x X 6) + (5x - 200) X 6} : {(4x X 6) + (4x + 400) X 6} = (30x + 30x - 1200) : (24x + 24x + 2400) = (60x - 1200) : (48x + 2400) Now, profit share of 'B' = 30000 - 10000 = Rs. 20,000 ATQ; [(60x - 1200) / (48x + 2400)] = 10000 / 20000 So, investment of 'B' = 1200 X 4 = Rs. 4,800
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