Milogram is not an English word.
Multiply the number of kilograms by 1,000,000 to get the same mass expressed in milligrams.
You cannot convert percentages to pounds. Percentages are comparisons of two related quantities so you can have one lot of pounds as a percentage of another lot, but not by itself. Otherwise you would be able to convert 25% of an inch into a pound!
To convert decimals into percentages, multiply by 100. 3.5 is 350%
Not a snake
Convert it.
6
150
1000ml
mass into parts per hundred ..... can't be done.
The simplest way is to convert them to like fractions, or percentages.
7500
5-325 mg