x - cena hurtowa
x+15%*x = 115
x+0,15x = 115
1,15x = 115 |:1,15
x = 100
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x - cena hurtowa
x+15%*x = 115
x+0,15x = 115
1,15x = 115 |:1,15
x = 100
115%/115zł da nam jeden procent ceny hurtowej.
1%=1zł| *100
100%=100zł
Towar kosztował 100 zł.