Around here the first acre is around $50 and each additional acre is around $25 to $30. My own lawn is 2 acres and I guarantee I can get a different crew every day to quote me $75. Not talking low ballers either. Crews with 4 or 5 guys in huge rigs with enclosed trailers and 2 ton dump body trucks. So lets say on the high side for 28 acres would come out to $860 to $900 to cut 28 acres. Now we are talking 3 60"+ ztr's going and 2 guys trimming. Knock it out quick enough to still have time left to do another small commercial job in a single day.