Cara has $25 to buy dry pet food and treats for the animal shelter. a pound of dog food costs $2 and treats are $1 apiece. if she buys 9 pounds of dog food, what is the greatests number if treats she can buy?

Cara has $25 to buy dry pet food and treats. 
If she buys 9 pounds of dog food and a pound of dog food costs $2, you can calculate how many treats she can buy using the following steps:

9 pounds of dog food * $2 = $18

$25 - $18 = $7 left

$7 / $1 = 7 treats

Result: Cara can buy 7 treats.

Iwould think that the correct answer is 8.1