First, add all of the working hours.
1 [tex] \frac{3}{4} [/tex] + 2 [tex] \frac{1}{3} [/tex] + 1 [tex] \frac{5}{12} [/tex]
Since the denominators are different, make them all the same.
1 [tex] \frac{9}{12} [/tex] + 2 [tex] \frac{4}{12} [/tex] + 1 [tex] \frac{5}{12} [/tex]
Add everything together.
4 [tex] \frac{1}{12} [/tex] + 1 [tex] \frac{5}{12} [/tex] = 5 [tex] \frac{6}{12} [/tex]
Then, simplify.
5 [tex] \frac{1}{2} [/tex] or 5.5
Multiply the time by the salary.
5.5*10.5= Doug earned $57.75