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0.8 * x = cena deskorolki po obniżce
1.1*0.8x = cena po podwyżce
0.88x = cena teraz = 528 zł
528 - 88%
x - 100%
88x - 52800/88
x= 600
Początkowa cena deskorolki wynosiła 600zł.