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0,15=15%
0,1=10%
razem 45%-odp:)
0,9 x 0,85 x 0,8a =0,612= 61,2%
39,8%
probably
0,15=15%
0,1=10%
po dodaniu: 20%+15%+10%=45%
Odp. Obniżono o 45% .