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We can say that Let, the initial investment of 'Amit' be Rs. 'a'. So, the initial investment of 'Shikha' = Rs. (a + 6000) ATQ, Ratio of profit shares of 'Amit' and 'Shikha' is = {[a × 12 + (a + 4000) × 12]:[(a + 6000) × 12 + (a + 6000 - 16000) × 4]} = {[12 × (a + a + 4000) ]:[4 × (3a + 18000 + a - 10000) ]} = {[3 × (2a + 4000) ]:{(4a + 8000) } = {[6 × (a + 2000) ]:[4 × (a + 2000) ]} = 6:4 = 3:2
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