Most blackjack tables pay 3:2 for a natural while others pay 6:5. On a 3:2 table, playing a hand of $10 would give you a $25 in return if you win with a natural (your original stake plus a profit of $15). Winning the round with any other hand apart from a natural pays even money.
The insurance bet pays 2:1, while a push (or a tie) means getting your original stake back without a profit.