Answer:
The mean cost of going to "A New Leash on Life" is $300.75, whereas the mean cost of going to "No Ruff Stuff" is only $224.65.
300.75 - 224.65 = 76.4. On average, the cost for a dog's annual visit to A New Leash on Life is $76.40 more than the cost for its visit to No Ruff Stuff.