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%
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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%
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