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x - 10%x = 90%x = 0,9x ------> cena towaru po obniżce
0,9x + 10%*0,9x = 0,9x + 0,09x = 0,99x
x - 0,99x = 0,01x
0,01*100% = 1%
odp. D
0.9x - cena po obnizce
0.9x * 1.1 - cena po podwyżce
0.9x * 1.1 = 0.99x
Odp: d)