OK, it has been awhile since I have done something like this, so I don't know what the going rate is. I have someone who wants a 20 x 16 concrete patio poured. So, I have 320 square feet. I will have about 4.5 yards of concrete needed for the job. Right now, in my area concrete is $83/yard. So, this person has 373.50 in concrete. I'm not sure on the price of sand, but I'm going to put down a sand base. Anyway, besides the price of all the material needed (concrete and sand), how much should I charge for a pretty basic project like this?