Jason sells computer software. He earns a base salary of $2,766.79 per month. In addition, he earns 9% of his total monthly sales in commission. If Jason earned $3,743.37 last month, then what was the amount of his total sales?

Let's start with saying he earned 2766.79. He he also earns 9% of his sales.

9% of something is just. 09 multiplied by that something. So if he earns 9% of 3743.37 plus the 2766.79, then we can say

y = 0.09 * 3743.37 + 2766.79

y = 3,103.69