The profit earned by selling a article at Rs. 5520 is equal to the loss incurred on selling the same article at Rs. 4080. What will be percent profit, if the article is sold at Rs. 6000?

$$\eqalign{ & {\text{Cost price of article}} \cr & = {\text{Rs}}{\text{.}}\left( {\frac{{5520 + 4080}}{2}} \right) \cr & = {\text{Rs}}{\text{.}}\frac{{9600}}{2} \cr & = {\text{Rs}}{\text{. 4800}} \cr & {\text{When selling price}} \cr & = {\text{Rs}}{\text{. 6000 then}} \cr & {\text{Profit}} = {\text{Rs}}{\text{.}}\left( {6000 - 4800} \right) \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = {\text{Rs}}{\text{. 1200}} \cr & \therefore {\text{Profit percent}} \cr & = \frac{{1200}}{{4800}} \times 100 \cr & = 25\% \cr} $$