I have a mowing customer with a garden area that is bordered with railroad ties. It is 36 feet X 15 feet. 12 ties in total, want the ties gone and the garden leveled and seeded. I figured rototiller the existing garden to loosen the soil and then roll it level. Then seed. I gave the guy a steal of a deal that i am too ashamed to post on here and he wanted me to do it for $300. What is it worth?