Boy sells a book for Rs. 450 he gets a loss of 10 %, To gain 10%, what should be the SP?
Choose the correct answer
A) rs . 320	B) rs . 450	C) rs . 550	D) rs . 640	E) rs . 680

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