'A' and 'B' started a business with an investment of Rs. 5,600 and Rs. 7,000, respectively. After 6 months, 'C' joined them with an investment of Rs. 8,400. If at the end of the year, the total profit of the business is Rs. 23,520, then find the profit share of 'B'.
Investments and Time: A: Rs. 5,600 for 12 months. B: Rs. 7,000 for 12 months. C: Rs. 8,400 for 6 months.  Calculate Effective Investments: A: 5600×12=67200 B: 7000×12=84000 C: 8400×6=50400  Investment Ratio: Ratio of A : B : C = 67200 : 84000 : 50400 = 4 : 5 : 3  Distribute Profit: Total profit = Rs. 23,520. B's share = (5/12) × 23520 = Rs.9800
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