Suppose your daily revenue from selling used DVDs is

R(t) = 100 + 10t (0 ≤ t ≤ 5)

dollars per day, where t represents days from the beginning of the week, while your daily costs are

C(t) = 87 + 5t (0 ≤ t ≤ 5)

dollars per day. Find the area between the graphs of R(t) and C(t) for 0 ≤ t ≤ 5.
$

What does your answer represent?