Answer:
[tex]F = 388500\,dollars[/tex]
Step-by-step explanation:
The revenue flows has the following function:
[tex]f(t) = 3000\cdot (1+5\cdot t)[/tex]
The total revenue obtained in the first seven years is obtained by using the concept of definite integral:
[tex]F = 3000\int\limits^7_0 {(1+5\cdot t)} \, dt[/tex]
[tex]F = 3000\cdot t|_{0}^{7}+7500\cdot t^{2}|_{0}^{7}[/tex]
[tex]F = 21000+367500[/tex]
[tex]F = 388500\,dollars[/tex]