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While selling 15 balls for Rs. 1,220, there is loss equal to the cost price of 5 balls. The cost price (in Rs. ) of one ball is:
Question

While selling 15 balls for Rs. 1,220, there is loss equal to the cost price of 5 balls. The cost price (in Rs. ) of one ball is:

A.

145

B.

122

C.

112

D.

120

Correct option is B

Given:

Selling price of 15 chairs = Rs. 1220.
Loss = Cost price of 5 chairs
Formula Used:
Loss = CP - SP
Solution:
Let C be the Cost price of one chairs
As we know,
Selling Price of 15 chairs = Cost Price of 15 chairs − Loss
1220 =15 − 5C
1220 = 10 C
= 122
Thus, the cost price of one ball is Rs.122

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