Ali works mowing lawns and babysitting. He earns 8.30 an hour for mowing and 7.80 an 1 hour for babysitting. How much will he earn for hour of mowing and 6 hours of babysitting?

For one hour of mowing, he will earn 8.30.

For 6 hours of babysitting, he will earn 6 * 7.80 = 46.80.
Therefore, in total, he will earn 8.30 + 46.80 = <<8.30+46.80=55.10>>55.10. Answer: \boxed{55.10}.