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x2--15%
x--100%
x--75%
x=25%
x - 0,1x = 0,9x - cena po 1 obnizce
0,9x - 0,15*0,9x = 0,765x - cena po 2 obnizce
x - 0,765x = 0,235x = 23,5 %
Odp. nalezy podniesc o 23,5 %