Task: Question Answering
Input (English): Problem: a grocer has 400 pounds of coffee in stock , 20 percent of which is decaffeinated . if the grocer buys another 100 pounds of coffee of which 50 percent is decaffeinated , what percent , by weight , of the grocer ’ s stock of coffee is decaffeinated ? 
Options: a ) 26 % , b ) 30 % , c ) 32 % , d ) 34 % , e ) 40 %
Output (English): a