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Ram sold an article to Shyam at a certain profit percentage. And Shyam sold it to Mohan at same profit percentage. If Mohan sold it to Rakesh at the original price and get 36% loss. Then find at what profit percentage Ram sold the article.
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Let the original cost price (CP) be $x$.

Selling price (SP) for Shyam (Shyam buying) $= x (\frac{p}{100} + 1)$ where $p$ is the profit percentage.

Selling price for Mohan $= x (\frac{p}{100} + 1) ( \frac{p}{100} + 1)$

Selling price for Rakesh $ = x = (1 -0.36) \times x (\frac{p}{100} + 1) ( \frac{p}{100} + 1)$

$\implies (p+100)^2 = \frac{10000}{0.64}$

$\implies p+100 = \frac{100}{0.8} =125$

$\implies p = 25\%$

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