SAT Question 29c177e6: Percentages answer and explanation with Desmos solution

Choice B is correct. $10\%$ of a quantity means $\frac{10}{100}$ times the quantity. Therefore, $10\%$ of $470$ can be represented as $\frac{10}{100}\left(470\right)$, which is equivalent to $0.10\left(470\right)$, or $47$. Therefore, $10\%$ of $470$ is $47$.