The main problem is that the question makes no sense at all.
A milligram is a measure of mass. A centilitre is a measure of volume. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
If you are not convinced, consider a centilitre of air. How many milligrams? Next consider a centilitre of water. How many milligrams?
The masses of equal volumes of the two substances will clearly be very different. So there is no direct conversion between mass and volume: you need to know the density of the substance to enable you to carry out the conversion.
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1000 mcg / 100 mg = 1 mg/ 100 mg = 0.011000 mcg / 100 mg = 1 mg/ 100 mg = 0.011000 mcg / 100 mg = 1 mg/ 100 mg = 0.011000 mcg / 100 mg = 1 mg/ 100 mg = 0.01
100
1 g = 1,000 mg 2 g = 2,000 mg 3 g = 3,000 mg . . . 100 g = 100,000 mg
1 cg = 10 mg so 100 cg = 10*100 mg = 1000 mg. Simple!
100 ng = 1000 mg