A man wanted to sell on article with 20% profit; but he actually sold at 20% loss for Rs. 480. At what price did he want to sell it to earn the profit.
Let the C.P. of the article be Rs. x.
Then, S.P. = Rs. x×(100−20)100
⇒480=x×80100
⇒x=480×10080
⇒x= Rs. 600
∴ S.P. at 20% profit = Rs. 600×(100+20)100
=600×120100= Rs. 720