There is a relationship between the number of hours a plumber works and the amount of money he earns. The plumber earns $60 for every 2 hours he works. Which statement about the relationship and the amount of money the plumber earns is true? Practice
A
The number of hours the plumber works is the independent variable in the relationship, and he earns $270 for 9 hours of work.

B
The amount of money the plumber earns is the dependent variable in the relationship, and he earns $540 for 9 hours of work.

C
The amount of money the plumber earns is the independent variable in the relationship, and he earns $540 for 9 hours of work.

D
The number of hours the plumber works is the dependent variable in the relationship, and he earns $270 for 9 hours of work.