A trader loses 25%, if an article is sold at Rs. 243. The selling price of the article to get a profit of 25% (in Rs.) is

By selling for 243 loses $25\%$

$c.p=\frac{s.p.\times 100}{(100-Loss\%)}=\frac{243\times 100}{(100-25)}=\frac{24300}{75}$

To gain 25% gain the selling price is

$s.p=\frac{c.p(100+profit\%)}{100}=\frac{\frac{24300}{75}(100+25)}{100}=405$ rupees