Textbook Problem

Modeling Data The predicted cost C (in hundreds of thousands of dollars) for a company to remove p% of a chemical from its waste water is shown in the table.

P	0	10	20	30	40
C	0	0.7	1.0	1.3	1.7

P	50	60	70	80	90
C	2.0	2.7	3.6	5.5	11.2

A model fat the data is given by

$C=\frac{124p}{\left(10+p\right)\left(100-p\right)}$

for $0\le p<100$. Use the model to find the average cost of removing between 75% and 80% of the chemical.