Answer :
Recall that the x% of y is given by the following expression:
[tex]y\cdot\frac{x}{100}\text{.}[/tex]Therefore, the 20% of 3,436 is:
[tex]3436\cdot\frac{20}{100}\text{.}[/tex]Simplifying the above expression we get:
[tex]687.2.[/tex]Answer: 687.2.