1 gram = 1000 milligrams
2.5 grams = 2500 milligrams
400/2500 * 100%
= 0.16 * 100%
= 16%
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1 milligram = 0.001 gram400,000 milligrams = 400 grams
20% of 2000 grams= 20% * 2000= 0.2 * 2000= 400 grams
This is not a proper conversion. Cubic centimeters (cc) is a measure of volume. Grams (g), kilograms (kg) and milligrams (mg) are measures of weight or mass.
5% of 400g= 5% * 400= 0.05 * 400= 20g
1000 micrograms = 1 milligram so 400 mcg = 400/1000 milligrams = 0.4 milligrams. Simple!