Incorrect
Find the unknown quantity in the following percent problem using the formula $R \cdot B=A$. Round your answer to two decimal places, if necessary.
18 is $\%$ of 520

Step 1 ：The question is asking for the percentage that 18 is of 520. The formula given is \(R \cdot B=A\), where \(R\) is the rate (or percentage), \(B\) is the base (or total), and \(A\) is the amount (or part). In this case, we know that \(A=18\) and \(B=520\), and we are trying to find \(R\). We can rearrange the formula to solve for \(R\) as follows: \(R=\frac{A}{B}\).

Step 2 ：Substitute \(A=18\) and \(B=520\) into the formula: \(R=\frac{18}{520}=3.4615384615384617\)

Step 3 ：Round the result to two decimal places: \(R=3.46\)

Step 4 ：Final Answer: The unknown quantity is approximately \(\boxed{3.46\%}\).