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how many roast beef sandwiches should the store make and sell each week to maximize its profit?

A local sandwich store has a fixed weekly cost of $525 and variable costs for making a roast beef sandwich are $0.55. let x represent the number of roast beef sandwiches made and sold each week. the function R (x)=-0.001x^2+3x describes the money, in dollars that the shop takes in each week from the sale f x roast beef sandwiches.

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