the answer is 12.5% but what is the formula to get that answer?

Assume that a division of MN Company has a 10% return on sales, income of $10,000, and an investment turnover of 4 times, its sales are Selected Answer: 3. $100,000 I Question 3 4 out of 4 points The following data pertains to AAA division of JJJ Company. Selling price per unit Variable cost per unit Total fixed costs Total investment of AAA division What is the return on investment (ROI) assuming that the sales of AAA division in units is Selected Answer: 4. 12.5% $15 $5 $100,000 $200,000 12,500