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50/100(50/100*140)=1/2*70=35
50/100(50/100*2000)=1/2*1000=500
b)33całe i 1/3%z66cał.i 2/3 liczby:
1/3(2/3*450)=1/3*300=100
1/3(2/3*7200)=1/3*4800=1600
c)5%z40%liczby:
5/100(40/100*1000)=1/20*400=20
5/100(40/100*240)=1/20*240=96
d)46%ze120%liczby:
46/100(120/100*30)=46/100*36=16 56/100=16,56
46/100(120/100*200)=46/100*240=110 4/10=110,4