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40%z135=0,40×135=54 135+54=189
38%z250=0,38×250=95 250-95=155
12,5z48=0,125×48=6 48+6=54
33⅓%z300=0,3×300=90 300-90=210
4%z4,5=0,04×4,5=0,18 4,5-0,18=4,32