Please need help with one. I did it the first time and I know it’s not B

Answer:
$14.89
Step-by-step explanation:
Retail store = $10 x 5 hrs = $50
Restaurant Manager = $21 x 4 hrs = $84
Total earnings throughout the day = $134
Total time worked = 9 hrs
Avg = Total earnings/Total time
=> 134/9
=> $14.89.