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p = 3%
120 zł czyli (3/100)x - odsetki
(3/100)x - 20%(3/100)x =
= (3/100)x - 1/5 * (3/100)x - odsetki po odliczeniu podatku
(3/100)x - 1/5*(3/100)x = 120 /*500
15x - 3x = 60 000
12x = 60 000
x = 5000
odp. należy wpłacić 5000 zł x)