A shopkeeper sold an article at a loss of 20%. If the selling price had been increased by ₹100, there would have been a gain of 5%. What was the cost price of the article?
The correct option is B ₹400
Let the C.P be ₹ x.
Loss is 20%
We know that,
Loss%=CP−SPCP×100
20=x−SPx×100
20x100=x−SP
SP=x−20x100
∴S.P=x×80100=80x100
When It is sold for 100 rupees more the gain is 5%=80x100+100=x×105100
x4=₹100
x=₹400
So, the cost price of the article is ₹400.