A store that installs cordless telephones finds that if it installs x telephones per week, its total costs will be C (x) = 40x + 975. It also finds that the demand function for their telephones is pa (x) = -x + 120. (a) Determine whether x = 65 is a breakeven point for the store. (b) Show that the store's total revenue per week is arbitrarily close to its total cost per week when the number of telephones they install per week are close to, but not equal to, 65.

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