Polash started 'a business on the first day of 2008. Qader joined the business of Polash on partnership contract with double investment of Polash on July 1 of 2008. Sohel, on the first day of September 2008, joined the partnership business of Polash and Qader with thrice the investment of Polash. The firm earned a profit of Tk. 72,000 on 31st December, 2008. What will be the share of profit of Sohel?

Explanation: ধরি, Polash এর investment \(x\) for 12 months. Qader এর investment \(2x\) for 6 months (July 1 to Dec 31). Sohel এর investment \(3x\) for 4 months (Sep 1 to Dec 31). Polash's investment time share \(= 12x\). Qader's investment time share \(= 2x \times 6 = 12x\). Sohel's investment time share \(= 3x \times 4 = 12x\). Investment shares are equal (12x:12x:12x or 1:1:1). So, Sohel এর Profit \(= \frac{72,000}{3} = 24,000\).