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x+0,1x = 1,1x
1,1x - 0,1*1,1x = 1,1x-0,11x = 0,99x
x-0,99x = 0,01x
0,01x = 1%
Cena zmalała o 1%
110%x * 10% = 11%
110% - 11% = 99 %
Odp:Cena zmalała o 1 %