To be clear, you're selling 1% of iota for approximately 238.22622 btc (11.911311 x 20) before launch or 297.782775 btc (11.911311 x 25) after launch and you're donating 5% to the foundation prior to the sale.
Is this correct?
Yes. I'll probably round those numbers up to 240 btc & 300 btc