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 options:
A) $150 B) $200 C) $250 D) $120 E) $100
Let C.P. be $x   Then 110% of x - 90% of x = 50   20% of x = 50   x/5 = 50   x = 250   Answer is $250
<result>C</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 ?