In a nutrition calculation, how many milligrams (mg) are equivalent to 2.4 micrograms (mcg) of vitamin B12?

• A. $0.00000024$ mg
• B. $0.0000024$ mg
• C. $0.0024$ mg
• D. $0.00024$ mg

Answer: (B)

Verified step by step guidance

1. Understand the units involved: micrograms (mcg) and milligrams (mg). 1 milligram (mg) is equal to 1000 micrograms (mcg).
2. Set up the conversion factor: since 1 mg = 1000 mcg, then 1 mcg = \frac{1}{1000} mg = 0.001 mg.
3. Multiply the given amount in micrograms by the conversion factor to convert to milligrams: 2.4 mcg \times 0.001 mg/mcg.
4. Write the multiplication explicitly as an equation: \$2.4 \times 0.001 = 2.4 \times 10^{-3}$ mg.
5. Express the final answer in decimal form without calculating the exact number, which will give the equivalent milligrams for 2.4 micrograms.