After allowing a discount of 20% on the marked price of a lamp, a trader loses 10%. By what percentage is the marked price above the cost price?

Given,


Discount = 20%



S.P. = …(i)


And trader lose is 10%



…(ii)


We have to find out % of marked price above cost price



=


=


=


% of marked price above cost price = 12.5%


17