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Given Cost and Price​ (demand) functions Upper C left parenthesis q right parenthesis equals 120 q...

Given Cost and Price​ (demand) functions Upper C left parenthesis q right parenthesis equals 120 q plus 45000 and p left parenthesis q right parenthesis equals negative 2.1 q plus 900​, what is the marginal revenue when profits are ​$14000​?

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