the calculation isn't 100% correct, but it's close.
I wanted an easy calculation, so I choose a weighted exchange rate in stead of calculating it for every person individually.
But it's close. This system doens't make a big difference.
Bitcoininformation, I request a full refund, but you'll get a bonus in monero
I want to spread this new currency so I try to donate as much in XMR as possible. open an account at mymonero.com and I'll send you 5 XMR.

edit: i'll send devthedev a small BTC donation.