Charlie works mowing lawns and
babysitting. He earns $9.30 an hour for mowing and $7.70 an hour for babysitting. How much will he earn for 6 hours of mowing and 4 hours
of babysitting?
For mowing lawns, Charlie will earn 6 hours * $9.30/hour = $<<6*9.30=55.8>>55.8.
For babysitting, Charlie will earn 4 hours * $7.70/hour = $<<4*7.70=30.80>>30.80.
In total, Charlie will earn $55.8 + $30.80 = $<<55.8+30.8=86.60>>86.60. Answer: \boxed{86.60}.