A and B undertake to do a piece of work for Rs. 18,750. A can do it in 20 days and B can do it in 30 days. With the help of C, they finished it in 8 days. How much C should be paid for his work in proportion?
1
Rs. 7,500
2
Rs. 5,000
3
Rs. 6,500
4
Rs. 6,250