A woman buys an article for 10% less than its value and sells it for 10% more than its value. His gain or loss percent is: Pick.
A) 12% B) 45% C) 20% D) 34% E) 78%
C   Let the article be worth Rs. x.   C.P. 90% of Rs. x = Rs. 9x/10   S.P. = 110% of Rs. x = Rs. 11x/10   Gain = (11x/10 - 9x/10) = Rs. x/5   Gain % = x/5 * 10/9x * 100 = 22 2/9 % &gt; 20%
<result>C</result>
A woman buys an article for 10% less than its value and sells it for 10% more than its value. His gain or loss percent is: