Actually, the gross profit margin is found after deducting the cost of goods from the gross sales.
If you take a gross sale of $1.3million, subtract the cost of goods of 30%, you get $910k
So the gross margin of 24.6% adds up to about $224k
Then add in taxes and rents.
Still, nowhere near what some of these people on here think these owners are making.
Operating margin is operating income divided by revenue. If the operating margin is 24.6%, operating income must be $320,000. If operating income were $224,000, that would reduce operating margin to 17.2%.