A tradesman sold an article at a loss of 10%. If the selling price had been increased by $50, there would have been a gain of 10%. What was the cost price of the article ? Choose the correct choice from the following:
A) $100	B) $250	C) $200	D) $150	E) $300
Let C.P. be $x   then, (110% of x)-(90% of x) = 50 or 20% of x=100   x/5 = 50   x=250   C.P. = $250   correct option is $250
<result>B</result>
A tradesman sold an article at a loss of 10%. If the selling price had been increased by $50, there would have been a gain of 10%. What was the cost price of the article ?