Answer : 2 Rs. 60 Explanation : Answer: B) Rs. 60 Explanation: Let the cost price of a ball is Rs.xGiven, on selling 17 balls at Rs. 720, there is a loss equal to the cost price of 5 ballsThe equation is :17x - 720 = 5xSolving the equation we get x = 60Therefore, cost price of a ball is Rs. 60.

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