Answer:
600 mg
Explanation:
If 5 mL equals 250mg then double the mL so you get 10mL and 500mg. After that you want to find out how many mg per mL so divide 250 by 5 to get 50mg per mL and because that is only per 1 mL you need to multiply by 2 to get 100 mg per 2 mL add the 500 and the 100 to get your answer: 600 mg for 12 mL. I hope this helps