By selling an article at ₹ 270, a man loses 10%. If he would sell it a

By selling an article at ₹ 270, a man loses 10%. If he would sell it at ₹ 360, his gain percent is

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This question was previously asked in
UPSC CAPF – 2013
Let the Cost Price (CP) of the article be ₹ X.
The man sells the article at ₹ 270, incurring a loss of 10%.
Selling Price (SP1) = CP – Loss
SP1 = CP – 10% of CP
270 = X – (10/100) * X
270 = X – 0.10X
270 = 0.90X
X = 270 / 0.90
X = 2700 / 9
X = 300
The Cost Price (CP) of the article is ₹ 300.

Now, the man sells the article at ₹ 360 (SP2).
Selling Price (SP2) = ₹ 360.
Cost Price (CP) = ₹ 300.
Since SP2 > CP, there is a gain.
Gain = SP2 – CP = 360 – 300 = ₹ 60.

The gain percent is calculated as (Gain / CP) * 100.
Gain percent = (60 / 300) * 100
Gain percent = (1 / 5) * 100
Gain percent = 20%.
His gain percent is 20.

Loss% = (Loss / CP) * 100, SP = CP – Loss. Gain% = (Gain / CP) * 100, SP = CP + Gain.
It is essential to calculate the Cost Price first using the information from the first transaction before calculating the gain or loss in the second transaction. Profit and loss percentages are always calculated on the Cost Price unless specified otherwise.