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Let the initial investments of A, B and C be Rs. 3x, Rs. 4x and Rs. 9x respectively. So the additional investment of A = 0.22 × 3x = Rs. 0.66x Additional investment of B = 0.25 × 4x = Rs. x Additional investment of C = 0.30 × 9x = Rs. 2.7x Ratio of investments of A, B and C = (3x + 3x + 0.66x):(4x + 4x + x):(9x + 9x + 2.7x) = 6.66x : 9x : 20.7x = 37 : 50 : 115 So the profit share of B = 50/(37 + 50 + 115) × 18180 = Rs. 4500
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