Doug earns $10.50 per hour working at a restaurant. on
friday he spent 1 & 3/4 hours cleaning, 2 & 1/3 hours doing
paperwork, and 1 & 5/12 hours serving customers. what were
doug’s earnings?

First, add all of the working hours.
1 + 2 + 1

Since the denominators are different, make them all the same.
1 + 2 + 1

Add everything together.
4 + 1 = 5

Then, simplify.
5 or 5.5

Multiply the time by the salary.
5.5*10.5= Doug earned $57.75