Ответ:

  1. \(25\%=\frac{25}{100}=\frac{1}{4}\).
  2. \(0{,}4\times100\%=40\%\).
  3. \(60\%=\frac{60}{100}=\frac{3}{5}\).
  4. \(\frac{3}{4}\times100\%=75\%\).