If the population of illinois is 12,700,000 and the population of the us is 307,000,000, what percent of the us population is in illinois?

4.13% of US population lives in Illinois.

Explanation:

In order to know the percent of the US population living in Illinois, we have to the following crossed multiplication:

307,000,000 = 100

12,700,000 = X

X = (12,700,000 . 100) / 307,000,000

X = 1,270,000,000 / 307,000,000

X =  4.13

As we can see, 4.13% of US population lives in Illinois.