Boy sells a book for Rs. 810 he gets a loss of 10 %, To gain 10%, what should be the SP? Choose the most appropriate option.
A) 430
B) 990
C) 550
D) 590
E) 600
Cost price = 810/90 x 100 = 900   To gain 10% = 900 x 10/100 = 90   SP = CP + gain = 900 + 90= 
<gadget id="calculator">900 + 90</gadget>
<output>990</output>
990   Answer : 990
<result>B</result>
Boy sells a book for Rs. 810 he gets a loss of 10 %, To gain 10%, what should be the SP?