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A trader buys an article at 80% of its marked price and sells it at 10% discount on its marked price. His percentage profit is:
Let M.p be market price of article
so Cp = $$\dfrac{80}{100}\times M.P $$
Sp = $$ M.P \times \dfrac{90}{100}$$
then % profit = $$ \dfrac {sp-cp}{cp}\times 100 $$
$$\Rightarrow \dfrac{10}{80}\times 100 $$
$$\Rightarrow 12.5 =12\dfrac{1}{2}$$ Ans
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