300mcg into 10g what percentage?

To find out what percentage 300 mcg is of 10 g, first convert 10 g to micrograms: 10 g equals 10,000,000 mcg. Then, divide 300 mcg by 10,000,000 mcg and multiply by 100 to get the percentage.

So, (300 mcg / 10,000,000 mcg) × 100 = 0.003%. Therefore, 300 mcg is 0.003% of 10 g.