Task: Question Answering
Input (English): Problem: the first half of the 20 th century , the population of a particular country increased by 200 percent . in the second half of the century , the population increased by 300 percent . what was the percent increase for the 20 th century as a whole ? 
Options: a ) 500 % , b ) 600 % , c ) 800 % , d ) 1100 % , e ) 1200 %
Output (English): d