6.75% of $75 is around $5.2. Add $5.20 to $75 and that make the total cost $80.20. No, $80 isn't enough to pay the service.
The total for the dog service is 75 dollars plus tax which is 75*.0675 which is $5.0625 which can be rounded to $5.06. The total 75 plus tax of 5.06 is $80.06 so no you do not have enough money