I live in somewhat rural Indiana and I am going to bid on a 13 acre cemetery. Stones are in nice straight lines, a few trees, and an average amout of stones maybe 2 or 3 acres with no stones at all. My largest account as of now is about a 4 acre cemetery. Not sure what to bid. Currently run a 48" Ferris and if I get this lawn I would be adding a 61" Ferris Also have a high school student willing to trim for $7 an hour Is 40 an acre too high?? Any thoughts?