Given the information on the problem, we can write the following proportions:
[tex]\frac{16800}{840000}=\frac{x}{1000000}[/tex]solving for x, we get:
[tex]\begin{gathered} \frac{x}{1000000}=\frac{16800}{840000} \\ \Rightarrow x=\frac{1000000\cdot16800}{840000}=20000 \\ x=20000 \end{gathered}[/tex]therefore, the tax is $20,000