A metal has a density of 7.8 g/cm37.8 \text{ g/cm}^37.8 g/cm3. What is this density in mg/mm3\text{mg/mm}^3mg/mm3? (Note: 1 cm=10 mm1 \text{ cm} = 10 \text{ mm}1 cm=10 mm, so 1 cm3=1000 mm31 \text{ cm}^3 = 1000 \text{ mm}^31 cm3=1000 mm3; 1 g=1000 mg1 \text{ g} = 1000 \text{ mg}1 g=1000 mg)
0.78 mg/mm30.78 \text{ mg/mm}^30.78 mg/mm3
7.8 mg/mm37.8 \text{ mg/mm}^37.8 mg/mm3
78 mg/mm378 \text{ mg/mm}^378 mg/mm3
780 mg/mm3780 \text{ mg/mm}^3780 mg/mm3