The point is that it actually is not 20+20+10. Potential buyers who follow nebostrangla's calculation might end up with not enough bitcoins in their wallets. Math class or not, it's relevant for people who want to buy bitcoins in order to purchase Redfox products.I agree an effective discount of 42.4% is a great deal but that's not the point. Debating how to calculate the 20+20+10 and the final result is something for math class, not the redfox forums.