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 ?	Answers
A) $400 B) $150 C) $300 D) $550 E) $610
Let C.P. be $x   Then 105% of x - 80% of x = 100   25% of x = 100   x/4 = 100   x = 400   $400nswer is $400
<result>A</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 ?