That price is fairly high.
With only paying around $25 per yard for mulch, and $15 for topsoil, that leaves spreading labor rates fairly high.
I don't think those prices would get much attention around here, but for comparison
depending on the mulch type, I'll install one yard for around $65, and topsoil for around $50-$55 depending on where in the yard it's going, and how many yards at a time.
Just some refernece though. if you can get those prices, all the more profit though!