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 70 cents more than the commodity Y? Choose one
A) 2010 B) 2011 C) 2012 D) 2013 E) 2014
The cost of commodity X increases by 10 cents per year relative to commodity Y.   The price of X must gain  20 + 70= 
<gadget id="calculator"> 20 + 70</gadget>
<output>90</output>
90 cents on commodity Y, which will take 9 years.   The answer is 2010.
<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 70 cents more than the commodity Y?