We hired someone to do a significant yard clean up that has taken about 50 man hours (3 people working two very full days). He quoted me $2500 but I know there were costs of buying the bark and disposal of the yard waste (of which there was a lot). Should I throw in an extra $500 or give each person a $100 tip? How would you handle it? I think the job may have been bigger than he realized when he quoted the price.