The revenue from the sale of industral motors is R = 250x + 300(4x + 7)-¹ - 100 where is the number of units sold. R' You do not need to expand out your answer. The marginal revenue, rounded to 2 decimal places, when 90 are sold is Use Marginal Analysis to approximate the change in revenue if the number of units sold increased from 90 to 93:

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