For doing big jobs, do you guys just figure your houly rate and add supply costing? I'm doing an overseed job, and figuring my rate of 30/hour (my hourly cost is 20) and with seed cost (with 15% margin) is comming to like ~$700. thats with aerating/ dethatching and low mowing. Do you uselly attach a modifier, or am i just thinking to big? The property is 11500 sq feet.