Consider the following table:
$$
\begin{array}{cccc}
& A & B & C \\
Person 1 & 10,000 & 20,000 & 20,000 \\
Person 2 & 20,000 & 15,000 & 15,000 \\
& x \% & 15 \% & 15 \%
\end{array}
$$
After a year, if Person 1's mutual fund value is 500 more than Person 2's, determine the value of \(x\).
