Answer:
With the 48th pay of the year, Carson will hit the OASDI taxable limit.
Explanation:
As per the OASDI taxable limit for 2018 is $128500.
Thus the tax day is calculated as
[tex]\$128700/\$2700\\=47.66 \approx 48[/tex]
So the tax day is the 48th pay day. And thus with the 48th pay of the year, Carson will hit the OASDI taxable limit.