A shopkeeper bought a dozen pens paying an amount of RS 180 and sold them at the rate of RS 18 each,what percentage is gain or loss?
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Here goes the solution!
Total price of a dozen = Rs. 180
Total number of pens = 12
Selling price of a pen = Rs. 18
Therefore, total selling price = 12 × 18 = Rs. 216
Gain = 216 - 180 = Rs. 36
Gain per cent = Gain/CP × 100
= 36/180 × 100
= 20%
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