That all depends upon what your "units" are.
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1000000000/500000 = 2000 (of 500000 in a Billion pounds)
A millilitre is a unit of capacity. A milligram is a unit of mass. The two units are therefore incompatible.
Milligram = mg 1000 mg = 1 g
0.1 microgram = 0.0001 milligrams
1 milligram = 1,000 micrograms 1 microgram = 0.001 milligram