Pine street inc. makes unfinished bookcases that it sells for $59.19. production costs are $38.02 variable and $9.94 fixed. because it has unused capacity, pine street is considering finishing the bookcases and selling them for $73.30. variable finishing costs are expected to be $5.55 per unit with no increase in fixed costs. prepare an analysis on a per unit basis showing whether pine street should sell unfinished or finished bookcases. (round answers to 2 decimal places, e. g. 15.25. enter negative amounts using either a negative sign preceding the number e. g. -45 or parentheses e. g. (