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x+20%x=1,2x
1,2x+10%1,2x=1,32x
Cena podniosła się o 32%.
x+20%=x+0,2x=1,2x
1,2x+10% z 1,2x=1,2x+0,1×1,2x=1,2x+0,12x=1,32x
x=100%
1,32x=z %
............
z=1,32×100
x=132%
132%-100%=32%
rzeczywista podwyżka była o 32%
120%*x - cena po pierwszej podwyżce
120%x+120%*x*10% = 120%x+12%x = 132%x
132%-100% = 32%
Odp. c)