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%