I am doing a mulching job for one of my customers. She just wants a top layer of mulch added on to cover up her current weeds. I went to the mulch place, and the guy told me it would be $20 + tax to fill up my 4x8 trailer with mulch. I called the lady and gave her an estimate of cost of mulch plus our labor for $200. I'm sure a 4X8 trailer of this mulch will get it all. Now, what I'm really getting at is, how do I price labor for these jobs?