What is $30\%$ of $350$?

$30\%$ of $350 = 0.30 \times 350 = 105$. Proportion method: $\dfrac{x}{350} = \dfrac{30}{100}$ gives $100x = 10{,}500$, so $x = 105$. Mental math shortcut: $10\%$ of $350$ is $35$. Three times that is $105$. - Trap D ($1{,}050$) keeps an extra factor of $10$ — common when forgetting to convert $30$ to $0.30$. - Trap B ($35$) computes only $10\%$. - Trap A ($30$) just echoes the percent.