The document discusses return on investment (ROI) and provides an example to calculate ROI. It presents a scenario of Shari considering investing in cosmetology school. The costs of the investment include $22,000 for tuition and living expenses, $9,360 in lost wages from working part-time, $1,300 for transportation, and $7,800 for childcare, totaling $40,460. The potential gains are a cosmetologist salary of $110,488 over 10 years. Calculating ROI as (gains - costs) / costs, Shari's ROI for the investment in cosmetology school is 173%.