I need to bid on a lot that is roughly 1/2 acre. It has a bed thats 20ft long in the front and a wall in the back. The whole yard is about 10 degrees from the sidewalk up the back yard. Meaning its all a hill but slight slope. Theres also about 5 trees or so to trim around. I was thinking $45 for a bid? Shouldn't take me more than 45 minutes. Any suggestions if i should go higher? I can mow the whole thing with my 48.