At the place where Charles works, he earns 0.005 day of vacation for every hour he works. So far this year, Charles has worked 110 full days and 6 half days. If a full work day for Charles is 8 hours long, how many full vacation days has he earned so far this year?
When you add up the half days (4 hours each) into full days you end up with a total of 113 days. Multiply 113 by 0.005 and you should end up with Charles having earned 4 and a half days of vacation
