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 90 cents more than the commodity Y?  Select: 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 + 90 = $1.10 cents on commodity Y, which will take 11 years.   The answer is 2012.
<result>C</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 90 cents more than the commodity Y?