I got stuck in a rounding error and the division I may have done wrong

Given
To find the value of x.
Now,
From the figure,
[tex]\begin{gathered} \tan x=\frac{CD}{DE} \\ \tan x=\frac{20}{9.7} \\ \tan x=2.0618 \end{gathered}[/tex]That implies,
[tex]\begin{gathered} x=\tan ^{-1}(2.0618) \\ x=64.1266 \\ x=64.1\degree \end{gathered}[/tex]Hence, the value of x is 64.1 degrees.