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Cullumber $ treet Inc. makes unfinished bookcases that it sells for $59. Production costs are $38 variable and $10 fixed. Because it has unused capacity. Cullumber Street is considering finishing the bookcases and selling them for $71. Variable finishing costs are expected to be $6 per unit with no increase in fixed costs. Prepare an analysis on a per unit basis showing whether Cullumber 5 treet should sell unfinished or finished bookcases. (Enter negotive omounts using either a negative sign preceding the number es. -45 or parentheseseg. (45).)