SAT Question 048811bd: 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 $370$ can be represented as $\frac{10}{100}\left(370\right)$, which is equivalent to $0.10\left(370\right)$, or $37$. Therefore, $10\%$ of $370$ is $37$.