A bought 636 articles and sold 600 of them for the price he paid for 636 articles. He sold the rest at the same price per piece as the other 600. Percent gain in this transaction is
Shortcut : SP = Rs. 636 and CP = Rs. 600
=> Profit % = $$\frac{636-600}{600}\times100$$
= $$\frac{36}{6}=6\%$$
=> Ans - (A)