A merchant changed his trade discount from 25% to 15%. This would increase selling price by
Let marked price = Rs. $$100x$$
If discount % = 25%
=> Selling price = $$100x \times \frac{75}{100}=Rs.$$ $$75x$$
Similarly, if discount % = 15%
=> Selling price = Rs. $$85x$$
$$\therefore$$ Increase in selling price = $$\frac{85x-75x}{75x} \times 100$$
= $$\frac{10}{3} \times 4=13\frac{1}{3}\%$$
=> Ans - (C)
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