Brief Exercise 20-05 Pine Street Inc, makes unfinished bookcases that it sells for $57. Production costs are $37 variable and $10 fixed. Because it has unused capacity, Pine Street is considering finishing the bookcases and selling them for $75. Variable finishing costs are expected to be $8 per unit with no increase in fixed costs. Prepare an analys on a per unit basis showing whether Pine Street should sell unfinished or finished bookcases. (Enter negative amounts using either a negative sign preceding the number eg.-45 or parentheses e... (45).) Sell Process Further Net Income Increase (Decrease) Sales price per unit Cost per unit Variable Fixed Total Net Income per unit The bookcases