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2,8 - cena netto
2,8 * 1,07=3 - cena brutto
zad 2
44 x 1,22 = 53.68
zad 3
535 : 1,07 = 500
zad 4
732 : 1,22 = 600
zad 5
x + x*0,3 =3,9
1,3x=3,9
x=3
zad 6
x - x*0,3 = 63
0,7x=63
x= 90
100%=40zł(cena netto)
40+2.8=42.8(cena brutto)
zad2
22%-44
122%=244
zad3
107%-535
100%=500
zad4
122%-732
100%=600
zad5
130%-3.9
100%=3
zad6
70%-63
100%=90