jmc

We can make the approximations $$\begin{array}{rl}487,000& \approx 500,000\\ 12,027,300& \approx 12,000,000\\ 9,621,001& \approx 10,000,000\\ 19,367& \approx 20,000.\end{array}$$ Using these instead of the original numbers for an estimate, we have $$\begin{array}{rl}\frac{(500,000)(12,000,000)+(10,000,000)(500,000)}{(20000)(.05)}& =\frac{500,000\times 22,000,000}{1000}\\ & =500,000\times 22,000\\ & =1.1\times 10^{10}\\ & \approx 10,000,000,000\to \boxed{10,000,000,000}.\end{array}$$ "Google says the answer is 10,887,305,816.1" ~ xxsc