180 is the degrees a straight line segment is. This means that
4x + 3x + 2x = 180.
Since these all have the same variable (x), then you can add the coefficients. (4,3,2)
9x = 180
180/9 = x
X = 20
Answer:
7,854,000
because the 308 people would have to be at least 500 to round up to 7,855,000
I think that the answer you are looking for is 0.3
You can complete this by solving:

Which should give you .274418 or 27.44%