Task: Question Answering
Input (English): Problem: the wages earned by robin is 40 % more than that earned by erica . the wages earned by charles is 60 % more than that earned by erica . how much percent is the wages earned by charles more than that earned by robin ? 
Options: a ) 14 % , b ) 23 % , c ) 30 % , d ) 50 % , e ) 100 %
Output (English): a