Introduction to Integrals

What is the relative approximation error between the Riemann Sum for $f(x)=x^2$ , with $x \in [2, 4]$ and $n=5$, using the right-most point of a given interval for $x_i$, and the exact area under the curve for the same function over the same interval?

Enter your answer as a percentage, without the % symbol. Round to the nearest integer.

Tip: The relative approximation error is computed as $Error_\% =\frac{ | \text{actual value} - \text{approximated value} | }{ \text{actual value}} \cdot 100 \%$