Boy sells a book for Rs. 540 he gets a loss of 10 %, To gain 10%, what should be the SP?  Select:
A) 430
B) 450
C) 550
D) 590
E) 660
Cost price = 540/90 x 100 = 600   To gain 10% = 600 x 10/100 = 60   SP = CP + gain = 600 + 60= 
<gadget id="calculator">600 + 60</gadget>
<output>660</output>
660   Answer :660
<result>E</result>
Boy sells a book for Rs. 540 he gets a loss of 10 %, To gain 10%, what should be the SP?