If a person's diet supplies 600 µg of copper daily, what percentage of the 900 µg adult RDA are they meeting? Show work.

• A. Exactly 100% because dietary copper is always fully bioavailable in all diets
• B. Approximately 150% of the RDA
• C. Approximately 6.67% of the RDA
• D. Approximately 66.7% of the RDA

Answer: (D)