50. Model with mathematics. A water company charges residential customers a quarterly flat fee of
$25 for up to 5000 gallons of water. The company
charges $10 per thousand for the first 10,000
gallons of water after the minimum allowance. The
next 10,000 gallons is $5 per thousand. All other
consumption over 25,000 is $2.50 per
thousand.
a. Write a piecewise function w(x) that can be
used to determine a customer's quarterly bill for
using x gallons of water.