Verified answer

а)62,4 - 100%

31,2 - х%                Х=31,2*100%/62,4=50%

б)31,2 - 100%

 62,4 - х%    Х= 62,4*100%/31,2=200%

в) 0,2 - 100%

 20 - х%       Х= 20*100%/0,2= 10000%