a.(20×1)+(40×6)+(60×7)+(80×9)+(100×2)=
20+240+420+720+200=1.600/25=0,064
b.80=9
c.80=8 60=7
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a.(20×1)+(40×6)+(60×7)+(80×9)+(100×2)=
20+240+420+720+200=1.600/25=0,064
b.80=9
c.80=8 60=7