Looks like A is the answer.
Answer:

Step-by-step explanation:
The picture of the question in the attached figure
we know that
The measure of the<u><em> interior angle</em></u> is the semi-sum of the arches that comprise it and its opposite.
so

I'm pretty sure it's D unless somebody can tell me where they got the 0's from for C, I'm planting my foot down and saying D.
55% because you add 80% and 30% which is 110% and divide that by 2.