Explicație pas cu pas:
[tex]\frac{x}{y} = 25\% \iff \frac{x}{y} = \frac{25}{100} \\ [/tex]
a)
[tex] \frac{y - x}{y} = \frac{100 - 25}{100} = \frac{75}{100} = 75\% \\ [/tex]
b)
[tex]\frac{2x + y}{100} = \frac{2\cdot 25 + 100}{100} = \frac{50 + 100}{100} \\ = \frac{150}{100} = 150\% \\ [/tex]
