Step-by-step explanation
The question wants us to obtain the margin of error
A margin of error tells you how many percentages points your results will differ from the real population value.
The formula to be used is
To do so, we will have to list out the parameters to be used

The next step will be to find the z-score value for a confidence level of 80%.
From the statistical table, we have

So, we can input the given data obtained into the formula
So we will have

So the margin of error (M.E.) = 4.163 (To 3 decimal places)