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(C) Let the original marked price be $MP_1 = 100x$.The trader buys the goods at a $20 \%$ discount,so the cost price $CP = 100x - 20x = 80x$.He wants

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$25$

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(C) Let the original marked price be $MP_1 = 100x$.The trader buys the goods at a $20 \%$ discount,so the cost price $CP = 100x - 20x = 80x$.He wants to make a profit of $25 \%$ on the cost price,so the required selling price $SP = 80x + 25 \% 	ext{ of } 80x = 80x + 20x = 100x$.Let the new marked price be $MP_2 = y$. He allows a discount of $20 \%$ on this new marked price,so $SP = y - 20 \% 	ext{ of } y = 0.8y$.Equating the two expressions for $SP$: $0.8y = 100x \Rightarrow y = \frac{100x}{0.8} = 125x$.The percentage increase over the original marked price is $\frac{125x - 100x}{100x} 	imes 100 = 25 \%$.

$A$ trader buys goods at a $20 \%$ discount on the marked price. If he wants to make a profit of $25 \%$ after allowing a discount of $20 \%$ on his new marked price,by what percent should his new marked price be greater than the original marked price?

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