Odpowiedź :
1200zl - 100%
x - 120%
x = 120% * 1200zl / 100% = 1440zl (cena brutto)
1440zl - 1200zl = 240zl (kwota podatku VAT)
1600zl - 100%
y - 120%
y = 120% * 1600zl / 100% = 1920zl
1200zl - 100%
x - 120%
x = 120% * 1200zl / 100% = 1440zl (cena brutto)
1440zl - 1200zl = 240zl (kwota podatku VAT)
1600zl - 100%
y - 120%
y = 120% * 1600zl / 100% = 1920zl