In Keno, there are 80 balls numbered from 1 to 80, and 20 are chosen at random. If you play a double number, you win if both numbers are chosen. This bet pays 11 to 1, and you have very close to a 6% chance of winning. If you play 100 times and stake $1 on a double-number each time, your net gain will be around ___, give or take ____ or so.