On selling 20 balls at Rs. 720, there is a loss equal to the cost price of 5 balls. The cost price of a ball is:  Pick one:  A) s. 48  B) s. 50  C) s. 55  D) s. 60  E) s. 70
(C.P. of 20 balls) - (S.P. of 20 balls) = (C.P. of 5 balls)   C.P. of 15 balls = S.P. of 20 balls = Rs.720.   C.P. of 1 ball = Rs.720/15	= Rs. 48.   s. 48nswer: Option s. 48
<result>A</result>
On selling 20 balls at Rs. 720, there is a loss equal to the cost price of 5 balls. The cost price of a ball is: