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.
<em>So next term after 100 would be 50. Next term after 50 would be 25.</em>
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.