Been asked by a developer I do work for to spray round up on some berms. I will need to send my guy in front to knock down the tall stuff. How's this pricing... Trimmer guy - $30 per hour Me spraying gly at 2 oz per gallo. With backpack - $70 per hour I figure if the weeds are bad then I'd use more mix but the increase in time would make up for it. Fewer weeds then less mix. It would be a lot easier with my z spray but I'm not willing to mix gly in a lawn sprayer. Best to charge per hour or per gallon?