Doubtful, actually. I've got friends in the business, some on the repair shop management end of things. As a rough rule they generally don't want to see any billable time charged at less than 3x the total labor burden of the tech. This is obviously to provide the ability to keep the doors open, the lights on, all the support personnel paid, and the ownership making a profit, So you have a helper who is making $10/HR, his additional burden of taxes, benefits, etc is another $5, so if he isn't billing at $45/hr he is a drag on the operation. Realistically, he might get three oil changes done in an hour, so your looking at $15 per in billing. The materials are more than $5, so it's a loss leader.