Give a quick stream of consciousness before answering the following question. A man buys two articles for Rs.1980 each and he gains 10% on the first and loses 10% on the next. Find his total gain or loss percent?
Options:
(A) 15
(B) 67
(C) 18
(D) 19
(E) 12
90 * 10/60 = 15 kmph
The answer: (A).