Please note that these calculation can only be used before during the ICO and before you participate. If you want to calculate it after you already participated or at the end of the ICO you have to remove the "MyInvestedBTC" in the denominator.

I have a question regarding early-adopters bonuses.
Where do they come from ? Are they from the foundation Lisk coins stock ?
The bonus is just a bonus at the calculations. That means if you have exchanged 1 BTC in the first week, they will count as 1.15 BTC. But we won't buy 0.15 BTC extra from the exchanges.

If you are talking about the day 1 reward, then we will take them from our own LISK.