Crane Street Inc. makes unfinished bookcases that it sells tor $58. Production costs are $38 variable and $10 fixed. Because it has unused capacity, Crane Street is considering finishing the bookcases and selling them for 571 . Variable finishing costs are expected to be $8 ber unit with no increase in fxed costs. Prepare an analysis on a per unit basis shewing whether Crane Strect should sell untinished or finished bookcases. (Enter nesative amounts using either a negative sign preceding the number eg. 45 or porentheses eg. ( 45 )