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:

relevant.

plank line by $20\%.$ 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?

$

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

$$ by $

$x$