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200+16=216
(80x6)/100=4,8
80-4,8=75,2
216+75,2=291,2
(291x100)/280=3,928571%
80zł(1-0,06)=75,20zł
200+80=280 zł
216+75,20=291,20zł
280 - 100%
291,2 - x
x = 291,2*100%/280
x=104%
104%-100% = 4%