By selling 12 pens for a rupee a woman loses 20%. How many for a rupee should he sell in order to gain 20%?
Pick:  A) 12  B) 14  C) 45  D) 8  E) 65

Rationale: "d 80 % - - - 12 120 % - - - ? 80 / 120 * 12 = 8"
Answer: D