Question

In 2006 there were 72 million dogs in u.s homes that number declined by 2 million in 2010 what was the percent decline in the number of dogs in u.s homes

Answer 1

It decline 2 million dogs. 2 million over 72 million = 1/36, which is approximately 2.8 percent. 

Answer 2

2.8 was the percent decline in the number of dogs in u.s homes