SAT Linear equations in one variable Question

In one week in 2017, a technician earned a total of $700 by working at her regular job and at a second job doing part-time work. The equation $16h+13c=700$ represents this situation, where $h$ is the number of hours worked at her regular job and $c$ is the number of hours worked at her second job. Which of the following is the best interpretation of 16 in this context?