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ATQ, Ratio of profit shares of 'A' and 'B' at the end of the year = {(4x X 7) + (4x - 400) X 5} : {(2x X 7) + (2x + 100) X 5} = (28x + 20x - 2000) : (14x + 10x + 500) = (48x - 2000) : (24x + 500) Now, profit share of 'B' = 21000 - 7000 = Rs. 14,000 ATQ; [(48x - 2000) / (24x + 500)] = 7000 / 14000 So, investment of 'B' = 500 X 2 = Rs. 1,000
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