Answer: 13.3 liters would have the same percent error for a 14 liter container.
Explanation:
Since we have given that
He measured the volume of a 4 liter container to be = 3.8 liter
We need to find the error for a 14 liter container.
So, We will use "Unitary Method" .
He will measure the volume of a 1 liter container to be

So, he will measure the volume of a 14 liter container to be

So, 13.3 liters would have the same percent error for a 14 liter container.