Calculate the mass fraction (%) of the components of the gas mixture according to the following data obtained by gas chromatography: benzene - S = 20mm2, k=0.78; toluene - S=22.9 mm2, k=0.79; ethylbenzene - S=30.5mm2, k=0.82; cumene - S=16.7 mm2, k=0.84.

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