To determine the relationship between Quantity A and Quantity B, we need to calculate Bonnie's annual salary from last year.
1. Set up the equation

We are told that Bonnie's salary was increased by $15 %$, resulting in a new salary of $\$ 68,425$.
Let $S$ represent last year's salary (Quantity A).

The increase can be expressed as:

$$
\(\begin{gathered}
\text { Last Year's Salary } \times(1+\text { Percentage Increase })=\text { This Year's Salary } \\
\qquad S \times(1+0.15)=68,425 \\
1.15 S=68,425
\end{gathered}\)
$$

2. Solve for $S$

Divide both sides by 1.15 to isolate $S$ :

$$
\(\begin{aligned}
& S=\frac{68,425}{1.15} \\
& S=59,500
\end{aligned}\)
$$

\(\text { So, Bonnie's annual salary last year was } \$ 59,500 \text {. }\)