Graph of TB & TC from Hours Working: The graph below measures the benefits and costs from working, from the perspective of a worker. The variable Q stands for the number of hours the worker works, such that the horizontal axis measures the hours of work per week. On the assumption that they can choose their hours, the worker estimates a total benefit ( TB) from working according to the equation, TB = . (The value "1.335" might be interpreted as the hourly wage paid to the worker.) The worker estimates their total cost from working with the equation, TC = . (The TC of each Q might be interpreted as including the displeasure of effort and exertion from working Q hours.) It can be assumed that TC > TB for all hours beyond point B (32.3).

Reference: TB & TC of Working

For the question below, use the following table in conjunction with the Figure: Graph of TB & TC of Hours Working.

Point	Q	TB	TC	NB	MC
I	8.075	10.78
C	16.15		14.520	7.041	1.335
F	24.23
B	32.3		43.120		2.207

Which of the points corresponds to the amount of hours worked where the NB is zero?

	A.	I
	B.	B
	C.	C
	D.	F
	E.	None of the above