Boy sells a book for Rs. 450 he gets a loss of 10%, To gain 10%, at price he should sell?
Select
A) rs . 400  B) rs . 450  C) rs . 550  D) rs . 600  E) rs . 650

Rationale: "find selling price to gain 10 % . now , we are asked to find selling price to gain 10 % profit . hint : selling price = ( 100 + gain % ) × c . p . 100 selling price = ( 100 + 10 ) × 500 100 selling price = ( 110 ) × 500 100 therefore , selling price = rs . 550 c"
Answer: C