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45 zł- 15%
x zł - 100%
15x=100*45
15x=4500 /:15
x= 300 zł
odp 300 zł
2)t=2,4 zł
s=3zł
a) x=3*100%/2,4=125%
odp sa droższe o 25%
b)x=2,4*100/3=80%
odp tansze o 20%