Task: Question Answering
Input (English): Problem: the annual interest rate earned by an investment increased by 5 percent from last year to this year . if the annual interest rate earned by the investment this year was 26.25 percent , what was the annual interest rate last year ? 
Options: a ) 25 % , b ) 24 % , c ) 23 % , d ) 22 % , e ) 21 %
Output (English): a