5. On selling 17 balls at Rs. 720, there is a loss equal to the cost price of 5 balls. The cost price of a ball is:
A.Rs. 55
B.Rs. 60
C.Rs. 45
D.Rs. 50
5. On selling 17 balls at Rs. 720, there is a loss equal to the cost price of 5 balls. The cost price of a ball is:
A.Rs. 55
B.Rs. 60
C.Rs. 45
D.Rs. 50