A pair of articles was bought for $810 at a discount of 10%. What must be the marked price of each of the article?  Choose the correct choice:	A) $300	B) $500	C) $350	D) $450	E) $600
S.P. of each of the article = 810/2= 
<gadget id="calculator">810/2</gadget>
<output>405</output>
$405   Let M.P= $x   90% of x = 405   x = 405*100/90= 
<gadget id="calculator">405*100/90</gadget>
<output>450</output>
$450   Answer is $450
<result>D</result>
A pair of articles was bought for $810 at a discount of 10%. What must be the marked price of each of the article?