Boy sells a book for Rs. 720 he gets a loss of 10 %, To gain 10%, what should be the SP?  Choose the correct choice from the following choices:
A) 430
B) 880
C) 550
D) 590
E) 600
Cost price = 720/90 x 100 = 800   To gain 10% = 800 x 10/100 = 80   SP = CP + gain = 800 + 80= 
<gadget id="calculator">800 + 80</gadget>
<output>880</output>
880   Answer : 880
<result>B</result>
Boy sells a book for Rs. 720 he gets a loss of 10 %, To gain 10%, what should be the SP?