your first bid was way too much call local people and ask them how much they charge. i use this formula 10 hours per 100 sq ft. base materials, paver sand gravel sealants etc . rentals. add all these together and then add on 36% your profit margin should be great. I work alone if i need some body i usually pay them ten per hour and they dont work more than 6.
now 80 dollars an hour seems a little high. but who am i to say im in indiana where everything is cheap. if your in a metro area you might get away with 80 per hour i use 30 per hour. if any body has any other suggestions please write them in.