Lisa and John are working at a summer camp. The amount of money John earns is represented by the equation\ m=8.5h m=8.5h , where hh represents the number of hours John works and mm represents the amount of money he earns, in dollars. The table below shows the amount of money Lisa earns while working at summer camp.

a. How much money does Lisa earn per hour?
$

b. Who earns more money per hour, Lisa or John? Explain your reasoning.