how much do i charge to fertilize a 5,000 sqft lawn

I charge double what the bag cost you. Be careful, here in Florida we cant put down anything except straight fertilizer. That means no weed-n-feed and no insecticides. You have to be a licensed PCO. I found out the hard way. Someone turned me in to the Department of AG. Stefan

thank you very much for the info . i did not know that i needed a licens for weed and feed . thanks again

EDDIE,
Yes as said above, check the AG laws and regulations. Here in NC you even have to be licensed to spray round-up commercially. Even on farms.