Answer:
D. sell 2.000 units for $10 each and then sell an additional 400 units for $8 each
Step-by-step explanation:
Since in the question it is mentioned that
Quantity demanded is 2,000 at a price of $10
And, the other case is
Quantity demanded is 2,400 at a price of $8
So here we can conclude that
The quantity demanded of 2,000 would be at a price of $10
And, the additional units i.e. 400 (2,400 - 2,000) would be at a price of $8
Therefore the correct option is d.