A started a business with an investment of Rs. 50,000. After 6 months, B joined him with capital of Rs. 70,000 and after another 3 months, C joined them with capital of Rs. 80,000. The profits at the end of the year are Rs. 31,500. Find the share of profits earned by A.
1
Rs. 20,000
2
Rs. 10,000
3
Rs. 15,000
4
Rs. 12,500