Overhead. Suppose you spent $12,000 for overhead last year. Suppose you have 250 customers. Suppose you do each customer 5 times, that would be 1250 applications. Divide $12,000 by 1250. You must charge each customer $9.60 per application for overhead. That overhead fee should be part of the stop charge, (base fee). Then you need a few dollars more to cover the average labor time and vehicle expense to arrive at the location. I know of a big company that used to have a $22 stop charge.