Answer:
Michael has the best pay.
Explanation:
Michael earns $10 every 30 minutes. There are 60 minutes in an hour (30x2). Michael earns $20/hour (10x2).
Nicole earns $18 every 1.5 hours. We could multiply this by two to get a whole number (1.5x2=3). Nicole earns $36 every 3 hours, meaning she earns $12/hour (36/3).
Doris earns $432 every 24 hours (8 hours/day x 3 days), meaning she earns $18/hour (432/24).