The following table shows Jace's earnings based on the number of hours that he works.
| | ||
- | :-: | :-:| :-:
Number of hours | $1$ | $2$| $3$
Jace's Earnings | $\$20$ | $\$30$ | $\$40$
**Are Jace's earnings proportional to the number of hours that he works?**
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