8. INDUSTRIAL OUTPUT At a certain factory,
the daily output is $$Q = 500L^{3/4}$$ units, where $$L$$
denotes the size of the labor force in worker-
hours. Currently, 2,401 worker-hours of labor are
used each day. Use calculus (increments) to
estimate the effect on output of increasing the size
of the labor force by 200 worker-hours from its
current level.