On selling 11 balls at Rs. 720, there is a loss equal to the cost price of 5 balls. The cost price of a ball is:	Choose the correct option:
A) s. 45
B) s. 50
C) s. 55
D) s. 60
E) s. 120
(C.P. of 11 balls) - (S.P. of 11 balls) = (C.P. of 5 balls)   C.P. of 6 balls = S.P. of 11 balls = Rs.720.   C.P. of 1 ball = Rs.720/6	= Rs. 120.   Answer: Option s. 120
<result>E</result>
On selling 11 balls at Rs. 720, there is a loss equal to the cost price of 5 balls. The cost price of a ball is: