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(5//25)*100%=(1/5)*100= 20%
2
100%-25%=75%
75%=0,75
160*0,75=120
Kurtka po obniżce kosztowala 120 zl
3.
x- cena wycieczki
30%= 0,3
x*0.3=540 /:0.3
x=1800
Wycieczka kosztowała 1800 zł
Proszę :)