1.
[tex]225zl - 150\% \\ x - 100\% \\ \\ x = \frac{225 \times 100}{150} = \frac{22500}{150} = 150zl[/tex]
[tex]150zl - 150\% \\ x - 100\% \\ \\ x = \frac{150 \times 100}{150} = 100zl[/tex]
Początkowa cena to 100 złotych
2.
[tex]15\% \times 4 = 0.15 \times 4 = 0.6[/tex]
[tex]4\% \times 15 = 0.04 \times 15 = 0.6[/tex]
Jest to równe