The cost of 5 bats and 18 balls is Rs. 6,500 and the cost of 2 bats and 20 balls is Rs. 4,200. What are the costs of one bat and one ball respectively?
1
Rs. 850, Rs. 125
2
Rs. 630, Rs. 115
3
Rs. 780, Rs. 150
4
More than one of the above
5
None of the above