I think the answer to this question will help you solve this: http://web2.0calc.com/questions/utopia-has-a-population-of-17-000-if-70-of-the-population-voted-in-the-last-presidential-election-how-many-people-voted-in-the-election_1
Try using the method I used to turn 215% into a fraction and a decimal (dont forget to reduce the fraction if you can!)
If you have any other troubles, let me know.
~Ninja
Yes, if you answer questions correctly and explain them well, you will get points from someone. Usually the moderators give people thumbs up for good answers, which gets you 3 points.
Here's a post where I explained the point system: http://web2.0calc.com/questions/why-does-my-profile-keep-saying-a-number