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4%:4=1%
1%-0,2%=0,8%
500*0,8%=4[zł]
ODP. Zosia otrzymała 4 zł odsetek
x - 4%
x=500 * 4% / 100%
x= 20 /4
x=5
5 - 100 %
x- 20 %
x=20*20%/100%
x=1zł. Chyba...