a)
[tex]200 - 100\% \\ x - 22\% \\ \\ x = \frac{200 \times 22}{100} = 2 \times 22 = \boxed{ 44}[/tex]
b)
3,7 - 100%
x - 3%
x = (3,7×3)/100 = 11,1/100 = 0,111
c)
300-100%
x - 12,5%
x = (300×12,5)/100 = 3750/100 = 3,75
