Stakes are shares in the entire reward amount. We offer stakes instead fixed amount of tokens per user action during our bounty campaign. The amount of token per stake will be calculated at the end of campaign as below:

Tokens per stake = Total number of tokens in campaign / Total number of stakes rewarded

For example,
If you have earned 200 stakes and total number of stakes is 20000 with total token reward 90M, then in this campaign you will be rewarded 200 * (90M/20,000) = 900,000 tokens