A concert promoter sells tickets and has a​ marginal-profit function given​ below, where P′(x) is in dollars per ticket. This means that the rate of change of total profit with respect to the number of tickets​ sold, x, is P′(x). Find the total profit from the sale of the first 260 ​tickets, disregarding any fixed costs.   P′(x)=2x-1050

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