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0,05 -20%*0,05=0,05 -20*0,05/100=0,05 -0,01=0,04=4% oprocentowanie po odjęciu podatku
k+0,04k=3120
1,04k =3120
k=3120/1,04
k=3000 zl
K+(5%*K)-20%*5%K=3120
K+0,05K-0,5*0,05K=3120
1,05K-0,01K=3120
1,04K=3120/:1,04
K=3000