100% - 10% = 90%
90% = 450zł
x*90%=450zł
x= 450: 9/10
x= 450* 10/9
x= 4500/9
x= 500 zł
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100% - 10% = 90%
90% = 450zł
x*90%=450zł
x= 450: 9/10
x= 450* 10/9
x= 4500/9
x= 500 zł