A company that sells radios has yearly fixed costs of $600,000. It costs the company $45 to produce each radio. Each radio will sell for $65. The company’s costs and revenue are modeled by the following functions, where x represents the number of radios produced and sold:

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C(x) = 600,000 + 45x R(x) = 65x. This function models the company's costs. This function models the company's revenue. Find and interpret (RC)(20,000), (RC)(30,000), and (R-C)(40,000).