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b)x* 0,05=8 /:0,05
x=160
x->1,5%
x=240*1,5%/100
x=3,6
y->100%
8->5%
y=8*100%/5%
y=160
1,5%*240=0,015*240=3,6
liczbe ktorej 5% wynosi 8
8\5%=8 \ 5/100=8*100/5=160