Each month, Renaldo earns a commission of 10.5% of his total sales for the month, plus a salary of $2,500. If Renaldo earns $3,025 in a certain month, what were his total sales?

If Renaldo earned $3,025, then his earnings from the commission on his sales are $3,025 – $2,500 = $525. So, $525 is 10.5% of his sales. Set up an equation to find the total sales: 525 = 10.5x/100
Solving this equation, x = 5,000.