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28 - 4.2 = 23.8
10% z 23.8 = 2.38
21.42
x - 15%
28*15/100 = 4,2
28-4,2 = 23,8 cena po piewrszej obnizce
23,8 - 100%
y - 10%
23,8*10/100 = 2,38
23,8- 2,38 = 21,42 zl cena po dwoch obnizkach
:)
28 - 100%
x - 85%
x= (28*85) : 100% = 2380 : 100 = 23,80
100%-10%=90%
23,80 - 100%
x - 90%
x= (23,80*90) :100% = 2142 : 100 = 21,42
Odp: Aktualna cena towaru to 21,42 zł.