Q1 of 59 Page 147

By selling note book for ₹ 22 a shopkeeper gains 10%. The cost price of the book is:

Given SP = ₹ 22 and gain = 10%



⇒


⇒ CP = 10 × Gain


Gain = SP – CP


⇒ SP = Gain + CP


⇒ 22 = Gain + 10Gain


⇒ 22 = 11 Gain


⇒ Gain =₹ 2


So, CP = 10 × Gain =₹ 20

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