Answer:
D
Step-by-step explanation:
Can I have Brainliest? I hope this helped and have a nice day!!!
Work:
64 / 2 = 32
3/4 / 2 = 3/8
3/4 = 6/8
6/8 / 2 = 3/8
Final answer 32 3/8
I think the answer is B. 150 i may be wrong though
I'm assuming the question looks like this?

If so then the answer should be:

Hope this helps!
The top 4 firms have (23 +22 +18 +12)% = 75% of the market.
The 4-firm concentration ratio is 0.75 or 75%.