what's the relationship between amounts and money ?

It all depends on a lot of things. For example, if I make longer detailed posts and write a lot of lines of useful information about the subject at hand then I will earn more for that post than if I just answered a discussion with one or two lines. Not only that, but it also depends how popular your discussions are, the more responses you get to your comments and discussions the more they are worth. Then there is the factor of how many posts you make. A good way of boosting your earnings is by getting referrals. For example, my first referral made me $0.14c on their first day posting which I earned from their posts, I didn't do anything at all!