Using the revenue concept, it is found that the combined revenue for the two brothers is of $460.
In this problem, we have that the earnings are given by:
Hence:
[tex]R = 250 + 210 = 460[/tex]
The combined revenue for the two brothers is of $460.
To learn more about the revenue concept, you can take a look at https://brainly.com/question/4001746