Cullumber Street Inc, makes unfinished bookcases that it sells for $58. Production costs are $38 variable and $10 fixed. Because it has unused capacity, Cullumber Street is considering finishing the bookcases and selling them for $74. Variable finishing costs are expected to be $7 per unit with no increase in fixed costs. Prepare an analysis on a per unit basis showing whether Cullumber Street should sell unfinished or finished bookcases. (Enter negative amounts using either a negative sign preceding the numbereg.-45 or parentheses eg. (45).) Process Further Sell Net Income Increase (Decrease) Sales price per unit LA $ Cost per unit Variable Fixed Total Net income per unit $ $ $ $ The bookcases