To earn money for college, Avery works two part-time jobs: A and B. She earns $\$10$ per hour working at job A and $\$20$ per hour working at job B. In one week, Avery earned a total of $s$ dollars for working at the two part-time jobs. The graph above represents all possible combinations of a number of hours Avery could have worked at the two jobs to earn $s$ dollars. What is the value of $s$?