Determine the equilibrium percentages of α-D-fructose and β-D-fructose using their specific rotations. The specific rotation of α-D-fructose is +92°, that of β-D-fructose is +18°, and the equilibrium mixture has a specific rotation of +38.5°.

• A. α-D-fructose: 60.0%; β-D-fructose: 40.0%
• B. α-D-fructose: 27.7%; β-D-fructose: 72.3%
• C. α-D-fructose: 50.0%; β-D-fructose: 50.0%
• D. α-D-fructose: 18.4%; β-D-fructose: 81.6%

Answer: (B)