Boy sells a book for Rs. 450 he gets a loss of 10%, find CP of the book?	Choose the correct answer:
A) Rs.350 B) Rs.400 C) Rs.500 D) Rs.550 E) Rs.620
Find cost price   Let C.P. of book = x and S.P. = Rs. 450   S.P. of book = C.P. – (10% of C.P.)   S.P. = x – (0.10x)   450 = 0.9 x   x i.e cost price = Rs.500   Rs.500
<result>C</result>
Boy sells a book for Rs. 450 he gets a loss of 10%, find CP of the book?