How much revenue does the company get from a customer who uses exactly 30 therms of gas in a month? 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.)

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