Answer
1240 mg
Work Step by Step
$1~g = 10 ~dg$
$1~g = 1000~mg$
$1~dg = 100~mg$
To convert from units of $dg$ to units of $mg$, we need to move the decimal point 2 places to the right.
$12.4 ~dg = 12.40 ~dg = 1240 ~mg$
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