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What percentage of NAD+ is reduced in a solution that had an absorbance of 0.9 at...

What percentage of NAD+ is reduced in a solution that had an absorbance of 0.9 at 260 nm before reduction, and an absorbance of 0.11 at 340 nm after the reaction? (The molar extinction coefficients of NAD+ are A260=18000, A340 = negligible. The molar extinction coefficient of NADH are A260 = 18000, A340 = 6200).

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