Not to say you do junk work but he is obviously looking for a cheap cut, he will take advantage of you.
If you bid on the job take into account that thous 50 trees will need to be cut and trimmed around so your cut time will go up
as for the trees 100.0 and thats if there in the same area
if i were you id start a little smaller to get the hang of pricing
I WORK HARD SO YOU DONT HAVE TO