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?** [[☃ radio 1]]