Answer
$34.392\%$
Work Step by Step
Given that the investment grows by $3\%$ during the 10 year period, the size of the original investment would be $1.03$ times its original value after the first year and $1.03^2$ after the second year. At the end of the 10 year period, the investment would have grown by a factor of
$$
\begin{aligned}
1.03^{10} & =1.34392 \\
\end{aligned}
$$
This means that the investment will have increased by $34.392\%$ during the 10 year period.
