A dog eats .5 of a pound of food every 50 minutes, at this rate how many pound will the dog have eaten after 200 minutes

The dog eats 2 pounds of food in 200 minutes. I got this: Since the dog eats .5 every 50 minutes, and you need to find how much he eats in 200, you have to do 200 divided by 50 first. The answer to that would be 4, so you would multiply 4 by the amount of food he eats in 50 minutes (.5), and get the answer of 2. Please correct me if I am wrong :)