Answer
$$
d=2.03 \mathrm{ft}
$$
Work Step by Step
$$
\begin{aligned}
↺+M_C & =-50 \cos 30^{\circ}(3)+\frac{4}{5}(80)(d)=0 \\
d & =2.03 \mathrm{ft}
\end{aligned}
$$
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