code:

%initialize cases. boy is total outcomes of at least one boy. noboys is total outcomes of no boys (all girls)
boy=0;
noboys=0;
index=0;
while(index<10000)
%loop 10,000 times
     %set each child to a random integer from 0 to 1. 0 will be boys, 1 will be girls.
     c1=randint(1,1,[0 1]);
     c2 = randint(1,1,[0 1])

     if(c1+c2==2)
     %this means both children were girls, increment noboys. Increment loop index.
          noboys=noboys+1;
          index =index+1;
     else if(c1+c2==1)
     %this means one child is a boy, increment boy, increment loop index.
          boy=boy+1;
          index=index+1;
          end
     end
%the other case, c1+c2 == 0 means both children were boys, ignore this case because it's impossible as given by the problem. Do not increment loop index.
end
boy_percent=boy*100/10000;
noboys_percent=noboys*100/10000;