Ok, let's see here.
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We need formulas!!
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I know you hate formulas...
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But we gotta use them!!
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Trust me, it's useful.
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So, how many ml in a mg?
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Let's see. 1 gram (gm.) = 1 millilitre (ml.)
1,000 milligram (mg.) = 1 gm.
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So, we thus know it takes 1,000 mg of liquid ( assuming water or something ) to fill up 1 ml.
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So... 480 mg?
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480/1000.
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That's 48/100.
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Or, 0.48.
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Hope I helped!!