Task: Question Answering
Input (English): Problem: a and b invests rs. 2000 and rs. 4000 respectively in a business. if a doubles his capital after 6 months. in what ratio should a and b divide that year ' s profit ?
Options: a. 3: 5, b. 3: 4, c. 9: 2, d. 9: 9, e. 3: 1
Output (English): b