Work these problem. (See Example.)
The Lacledge Gas Company in St. Louis, Missouri in the winter of 2012–2013 charged customers $21.32 per month plus $1.19071 per therm for the first 30 therms of gas used and $.57903 for each therm above 30.
(a) How much revenue does the company get from a customer who uses exactly 30 therms of gas in a month?
(b) Find the rule of the function R (x) that gives the company’s monthly revenue from one customer, where x is the number of therms of gas used. (Hint : R (x) is a piecewise- defined function that has a two-part rule, one part for x ≤ 30 and the other for x > 30.)
Example
The energy company New York State Electric and Gas charges each residential customer a basic fee for electricity of $15.11, plus $.0333 per kilowatt hour (kWh).
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