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20 000[zl]-----100[%]
22 200[zl]------x
20 000*x=22 200 * 100
20 000x=2 220 000 /:20 000
x=111[%] -tyle % ma ta zwrocona kwota
terazx odejmujemy procenty, zeby wiedziec ile wynosi stopa procentowa, wiec:
111%-100%=11%
Stopa procentowa wynosi 11%;))