600,000 - x / 600,000 = .10
solve for x.
Shouldn't there be parentheses around 600,000-x ?
It makes a big difference in the answer.
WITH parentheses, you can rewrite the equation as
600,000 - x = 60,000
and the answer is x = 540,000
WITHOUT parentheses, you would get
599,999.9 = x/600,000
x = 359,999.940