Table 1-4 Eva Runs a Small Bakery in the Village

Multiple Choice

Table 1-4
Eva runs a small bakery in the village of Roggerli. She is debating whether she should extend her hours of operation. Eva figures that her sales revenue will depend on the number of additional hours the bakery is open as shown in the table above. She would have to hire a worker for those hours at a wage rate of $12 per hour.
-Refer to Table 1-4. What is Eva's marginal cost if she decides to stay open for two hours instead of one hour?

A) $12
B) $24
C) $36
D) $71