Answer:
B. $10
Explanation:
See attached graph.
The y-intercept of "50" is the fixed flat rate tom is paid.
Let's check 2 points.
At 1 hour tom is paid 60 (total) and at 2 hours tom is paid 70 (total). Clearly, we can see that his increase is "10". This is his hourly rate.
Breaking it up,
1st hour - 50 flat + 10 hourly = 60 [correct, matches]
2nd hour - 50 flat + 10 hourly for 2 hours = 50 + 2*10 = 50 + 20 = 70 [correct, matches]
So, Tom's hourly rate is $10.
Answer choice B is right.