Answer:
option (a) $7
Explanation:
Data provided in the question:
Cost of product A = $6
Contribution margin of product A = $3
Cost of product B = $12
Contribution margin of product B = $4
Now,
Selling price of product A
= Cost of product A + Contribution margin of product A
= $6 + $3
= $9
Selling price of product B
= Cost of product B + Contribution margin of product B
= $12 + $4
= $16
Therefore,
The differential revenue
= Selling price of product B - Selling price of product A
= $16 - $9
= $7
Hence,
the answer is option (a) $7