Welcome to our forum.
That’s less than a yard of concrete so figure 100 material another 100 mesh reinforcing another 100 forms and then the trucking cost. They charge the same for 1 yard as 10. Labor to get out stump and remove top soil and then a gravel base. If it is in back yard all material has to be brought around by hand. Then the cost to finish and clean up. This type of job is a nuisance job for a concrete guy as it is too small to do for the expense of getting people and machines out for just a few minutes work. So they put a good price on it and if they get it great they can make a 1000 bucks and if not that’s ok also. If you find a handy man type guy willing to do it with his little mixer you might get it done for half your quote. Location as mention above widely changes price also.