When grouping ideas in an outline, it is important to remember to follow a pattern. You might group them according to concepts, in chronological order, in order of importance, etc. However, you need to make sure your ideas are coherent and they respect certain concepts. if not, when you start writing it would be difficult to organize a clear assay.
Answer:
informal is the first sentence and formal is the second sentence.
The answer to this question would be 6 times 80 years, so the answer is 480 days Jenie