Answer:
3,333.33 will be the amount of sugar in milligrams.
Step-by-step explanation:
Amount of sugar in 12.00 g of milk chocolate bar = 8.000 g
Amount of sugar in 1 g of milk chocolate bar =

Amount of sugar in 5.000 of milk chocolate bar :

1 g = 1000 mg
3.33333 g = 3,333.33 mg