A tradesman sold an article at a loss of 20%. If the selling price had been increased by $100, there would have been a gain of 5%. What was the cost price of the article ? Options:	A) $100	B) $200	C) $300	D) $400	E) $500
Let C.P. be $x   then, (105% of x)-(80% of x) = 100 or 25% of x=100   x/4 = 100   x=400   C.P. = $400   correct option is $400
<result>D</result>
A tradesman sold an article at a loss of 20%. If the selling price had been increased by $100, there would have been a gain of 5%. What was the cost price of the article ?