Answer:
Find out the how much is his overall budget .
To prove
Let us assume that the overall budget of Mr.Hollins be x.
As given
Mr. Hollins determined that he gives away $800 each month.
If he gives away 16% of his budget.
16% is written in the decimal form.

= 0.16
Than the equation becomes
x × 0.16 = 800

x = $5000
Therefore the overall budget of Mr.Hollins be $5000 .