The price of commodity X increases by 30 cents every year, while the price of commodity Y increases by 20 cents every year. If in 2001, the price of commodity X was $4.20 and the price of commodity Y was $4.40, in which year will commodity X cost 40 cents more than the commodity Y?
Choose the correct choice
A) 2007 B) 2008 C) 2009 D) 2010 E) 2011
The cost of commodity X increases by 10 cents per year relative to commodity Y.   The price of X must gain  20 + 40= 
<gadget id="calculator"> 20 + 40</gadget>
<output>60</output>
60 cents on commodity Y, which will take 6 years.   The answer is 2007.
<result>A</result>
The price of commodity X increases by 30 cents every year, while the price of commodity Y increases by 20 cents every year. If in 2001, the price of commodity X was $4.20 and the price of commodity Y was $4.40, in which year will commodity X cost 40 cents more than the commodity Y?