A gas company has the following rate schedule for natural gas usage in single-family residences:

Monthly service charge $8.80

Per therm service charge
1st 25 therms $0.6686/therm
Over 25 therms $0.85870/therm

What is the charge for using 25 therms in one month? Show your work.
What is the charge for using 45 therms in one month? Show your work.
Construct a function that gives the monthly charge C for x therms of gas.

Question

A gas company has the following rate schedule for natural gas usage in single-family residences:
 
                Monthly service charge                  $8.80
 
                Per therm service charge 
                                1st 25 therms                      $0.6686/therm
                                Over 25 therms                  $0.85870/therm
 
What is the charge for using 25 therms in one month? Show your work.
What is the charge for using 45 therms in one month? Show your work.
Construct a function that gives the monthly charge C for x therms of gas.