Answer:
No, not proportional
Step-by-step explanation:
If Jace works 1 hour, he earns $20. Were his earnings directly proportional to his hours, then he'd earn $40 for 2 hours' work, $60 for 3 hours' work, and so on. But that's not the case; the table disagrees. So: NO, Jimmy's earnings are not proportional to the number of hours that he works.