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107% --- 642zł
100% --- x zł
x = 100*642 / 107
x = 64200/107
x = 600zł
1,07x = 642 /:1,07
x = 600
Cena leków wynosi 600 zł.
;))
x+7/100x=642
107/100x=642 |*(100/107)
x=600
Odp: Cena leków netto wynosi 600 zł.