An amusement company maintains records for each video game it installs in an arcade. Suppose that C(t) and R(t) represent the total accumulated costs and revenues (in thousands of dollars), respectively, t years after a particular game has been installed. If

C′(t) = 2 and R′(t) = 9e^-0.3t

then find the area between the graphs of C′ and R′ over the interval on the t axis from 0 to the useful life of the game and interpret the results.