Discussion :: Profit and Loss

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:
Answer : Option D
Explanation :
(C.P. of 17 balls)  (S.P. of 17 balls) = (C.P. of 5 balls)
C.P. of 12 balls = S.P. of 17 balls = Rs.720.
C.P. of 1 ball = Rs.  \([\frac { 720} {1 2 } ]\)  = Rs. 60.  
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