Your job as a salesman offers you 2.5% commission on all sales and a monthly base salary of $900. If you had sales this month of $13,175, $28,314, and $19,628, what did you make in total for the month?

First you need to calculate the commission earned on sales

(13,175 + 28,314 + 19,628) * 0.025 = 1,523.43

Then add to the monthly base salary

1,523.43 + 900 = 2,423.43

The total amount of money earned that month is $2,423.43.