The correct answer is $0.40.
Red Snaps cost $0.25 per ounce, so for 8 ounces, it would be $0.25 x 8 = $2.00.
Blue Tarts cost $0.30 per ounce, so for 8 ounces, it would be $0.30 x 8 = $2.40.
To find the difference, you subtract the cost of Red Snaps from the cost of Blue Tarts:
$2.40 - $2.00 = $0.40.
Therefore, it would be $0.40 more expensive to get a bag of Blue Tarts instead of a bag of Red Snaps.