A fair price shopkeeper takes 10% profit on his goods. He lost 20% goods during theft. His loss percent is?  Choose one:  A) 16  B) 18  C) 17  D) 12  E) 12

Rationale: "suppose he has 100 items . let c . p . of each item be re . 1 . total cost = rs . 100 . number of items left after theft = 80 . s . p . of each item = rs . 1.10 total sale = 1.10 * 80 = rs . 88 hence , loss % = 12 / 100 * 100 = 12 % answer : d"
Answer: D