Answer : The volume require will be, 3.2 mL
Explanation :
As we are given that the stock dose is 50 mg per 2 mL.
Now we have to determine the amount of volume require.
As, 50 mg of Tramadol Hydrochloride injection require volume = 2 mL
So, 80 mg of Tramadol Hydrochloride injection require volume =

Therefore, the volume require will be, 3.2 mL