A casino I frequent is offering side bets in blackjack. A regular game is $5 or $10 minimum bet. The side bets are black or red pays 3 to 1 and point total of 20 pays 8 to 1. Bets are resolved based on the player's original two cards ($50 max 8 decks). My questions are what is the casino edge for each bet and is there a card counting system for these bets?

Thanks

Judy