What does (100%) mean?

When you go to ''view previouse answered questions' on your own profile and there are questions you answered with a (100%) next to it...what does it mean?

one person thought your answer was helpful
this can be either the person whos question you answered or someone else who thought it was helpful
75% means 1 out of 3 people though it was helpful, so 2 people didnt
50% means one person thought it was helpful, and one person didnt
and 0% means of the people who rated it, none of them thought it was helpful

That means people think it's really helpful and have rated it 100%

100% of the people who rated it liked it. 50% would mean that one person rated it 'helpful' but another marked it 'unhelpful' etc.

It means your answer was helpful.

perfection

100% good .. helpful answer