Rate schedule for natural gas usage in single-family residences:
Monthly customer charge $6.45
Distribution charge
1st 20 therms $.02012/therm
Next 30 therms $0.1117/therm
Over 50 therms $0.0374/therm
Gas supply charge $0.7268/therm
Find the charge for using 202 therms in the month? Create and graph the function which gives monthly charge C for x therms of gas.