By selling 16 pens for a rupee a woman loses 5%. How many for a rupee should he sell in order to gain 18%?  Pick one
A) 12
B) 14
C) 45
D) 13
E) 65

Rationale: d 95 % - - - 16 118 % - - - ? 95 / 118 * 16 = 13
Answer: D