We are given the following information
Base monthly salary = $600
Commission on total sales per month = 8.25% = 0.0825
Let y represent the total compensation of the executive.
Let x represent the total sales per month of the executive.
Then we can write the following equation
Here 1.0825 represents the addition of the commission amount.
We are asked to find the executive total sales during a month in which he/she receives total compensation of $4109.55
This means that we need to find x for a given y = $4109.55
Therefore, the total sales during the month were $3242.08