Answer:
He currently claim 4 withholding allowances.
Explanation:
We can get the answer using the image attached.
As the problem indicates, Mario has earning of $784.21, which is placed between 780 and 800.
Also, the problem shows that Mario would have $13 more in his take home pay, if you look the image, that amount is calculated from 20-7, from 4 and 5 amount of income tax withheld.