A pair of articles was bought for $900 at a discount of 10%. What must be the marked price of each of the article? Choose the correct choice from the following choices
A) $300	B) $500	C) $350	D) $400	E) $600
S.P. of each of the article = 900/2= 
<gadget id="calculator">900/2</gadget>
<output>450</output>
$450   Let M.P= $x   90% of x = 450   x = 450*100/90= 
<gadget id="calculator">450*100/90</gadget>
<output>500</output>
$500   Answer is $500
<result>B</result>
A pair of articles was bought for $900 at a discount of 10%. What must be the marked price of each of the article?