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Q.

On selling 17 balls at Rs. 720, there is a loss equal to the cost price of 5 balls. Find cost price of a ball.


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a

Rs. 45

b

Rs. 50

c

Rs. 55

d

Rs. 60 

answer is D.

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Detailed Solution

Given,
Selling price of 17 balls = Rs. 720
Loss equal to the cost price of 5 balls
Suppose
Cost price of the single ball = X
So, the cost price of the 17 balls = 17x
According to the question
Loss = Cost price – Selling price
Loss = 17x-720
17x-720=5x     {Loss equal to the cost price of 5 balls}
⇒12x=720
⇒x=60
Hence the cost price of the ball = Rs. 60.
Correct option is 4.
 
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