Find the resultant vector from the figure from below:

$\begin{array}{ll}

1.&10\\

2.&20\\

3.&30\\

4.&10\sqrt{7}\\

5.&20\sqrt{7}\\

\end{array}$

What I've attempted to do was to find the resultant as follows:

$R=\vec{v}+\vec{w}+\vec{u}+\vec{c}+\vec{u}+\vec{b}$

$\vec{v}+\vec{w}+\vec{u}=2\vec{c}$

$2\vec{c}+\vec{u}=\vec{b}$

Then

$R=2\vec{c}+\vec{c}+\vec{u}+2\vec{c}+\vec{u}$

$R=5\vec{c}+2\vec{u}=5(10)+2(\sqrt{3})$

However, this answer $50+2\sqrt{3}$ doesn't appear in any of the alternatives. What could it be wrong? Help! Please.