Task: Question Answering
Input (English): Problem: a certain company reported that the revenue on sales increased 50 % from 2000 to 2003 , and increased 80 % from 2000 to 2005 . what was the approximate percent increase in revenue for this store from 2003 to 2005 ? 
Options: a ) 20 % , b ) 40 % , c ) 35 % , d ) 32 % , e ) 29 %
Output (English): a