1 lb = 0.453592 kg (to 6 dp) so 20 lb = 9.071847 kg = 9071847 mg
1 kg = 1,000,000 mg
There is .230500 Kg in 230500 mg.
1.2 kg = 1200 mg
Since there are 1000 mg in 1 gram, and 1000 g in 1 kg, there are (1000 x 1000) mg in 1 kg, which is 1,000,000 mg in 1 kg. Or conversely, there are 0.000001 kg in 1 mg (that's 10-6 kg)
20 mg/kg
730 mg is 0.00073 kg
One million mg per kg
270,000,000 mg
112,000 mg
22,000,000 mg
592,000,000 mg