Answer:
Step-by-step explanation:
This question asks for the sum of the first 5 terms of the series.
Looking at the first 3 terms, we can see that each successive term is half of the one before it.
So next term after 100 would be 50. Next term after 50 would be 25.
Thus, we can write:
400 + 200 + 100 + 50 + 25 + ...
We already have first 5 terms, the sum is:
400 + 200 + 100 + 50 + 25 = 775
Answer choice B is right.
