Naresh, Gopi and Sarath started a business with investments of ₹ 10000, ₹ 20000 and ₹ 20000 respectively. After 6 months Gopi withdrew an amount of ₹ 5000 from his investment. After 3 more months, Sarath added ₹ 10000 to his investment. If at the end of the year, the total profit earned is ₹ 36000, then find the share of each.