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x*7% = 6,65
x*00,7 = 6,65
7x = 665
x = 95
x + 6,65 = 101,65
Państwo Kucharscy zapłacili za obiad i napiwek 101,65 zł, a za sam obiad 95 zł.
100% - x zł
______________
x=100*6,65/7
x=665/7
x=95
95zł+6,65zł=101,65zł
100%- x
x= 95
95+ 6,65= 101,65