In a normal, healthy individual, the fasting blood sugar level per 100 ml of blood is typically in the range of 80-100 mg. This means that after an overnight fast (around 8 hours without food or drink), the concentration of glucose in the blood falls within this range.

Option 1 states that the normal fasting blood sugar level is 30-50 mg. This is incorrect and too low.

Option 2 suggests that the normal range is 50-70 mg. This is also incorrect, as the actual range is higher.

Option 3 is the correct answer, as it accurately states that the normal fasting blood sugar level is 80-100 mg per 100 ml of blood.

Option 4 states that the normal range is 120-140 mg, which is too high.

Therefore, the correct answer is option 3.