How do you add a 15 percent commission on net sales?

To add a 15 percent commission on net sales, first calculate the total net sales amount. Then, multiply that amount by 0.15 (which represents 15 percent). Finally, add the calculated commission to the net sales to find the total amount including the commission. For example, if net sales are $1,000, the commission would be $150, making the total $1,150.