Structuring a Keep$-$or$-$Drop Product Line Problem with Complementary Effects

Shown below is a segmented income statement for Hickory Company's three wooden flooring product lines:

variable costs are relevant.

and sales of the plank line by $5\%.$ All other information remains the same.

Required:

If the parquet product line is dropped, what is the contribution margin for the strip line? For the plank line?

Contribution Margin

Strip line

$$

Plank line

$$

Which alternative $($keep or drop the parquet product line$)$ is now more cost effective?

Drop the parquet product line $$

By how much?