248. When determining ethyl alcohol by gas chromatography, the height of the peaks was measured depending on the mass of alcohol and the following data were obtained:
Weight, mg 0.2 0.4 0.6 0.8 1.0
Peak height, mm 18 37 48 66 83
For 0.025 g of the test solution, a peak with a height of 77 mm was obtained. Calculate the percentage of ethyl alcohol.

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