x-lokata
odsetki - podatek od odsetek=42
x*1.4%-20%(1.4%x)=42
0.014x-0.2(0.014x)=42
0.014x-0.0028x=42
0.0112x=42
x=3750
wplacono 3750 euro
odsetki:
100%-20%=80%=42 euro
80%x=42
x=42:0,8
x=52,50euro
z= kwota wpłaty
1,4%z=52,50
z=52,50:1,4%
z=52,50:0,014=3750euro wpłacono
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x-lokata
odsetki - podatek od odsetek=42
x*1.4%-20%(1.4%x)=42
0.014x-0.2(0.014x)=42
0.014x-0.0028x=42
0.0112x=42
x=3750
wplacono 3750 euro
odsetki:
100%-20%=80%=42 euro
80%x=42
x=42:0,8
x=52,50euro
z= kwota wpłaty
1,4%z=52,50
z=52,50:1,4%
z=52,50:0,014=3750euro wpłacono