1. If the cost C (in dollars) of removing p percent of the particulate pollution from the exhaust gases at an industrial site is given by
C(p) = 8100p / 100 - p
find the rate of change of C with respect to p.
2. If the cost C (in dollars) of removing p percent of the impurities from the waste water in a manufacturing process is given by
C(p) = 9800p / 101 - p
find the rate of change of C with respect to p.