a)
[tex]20 - 100\% \\ x - 20\% \\ \\ x = \frac{20 \times 20}{100} = \frac{1 \times 20}{5} = 4os.[/tex]
b)
[tex]20 - 100\% \\ x - 70\% \\ \\ = \frac{20 \times 70}{100} = \frac{2 \times 7}{1} = 14os.[/tex]
c)
[tex]20 - 100\% \\ x - 10\% \\ \\ x = \frac{20 \times 10}{100} = \frac{2 \times 1}{1} = 2os.[/tex]
