Important note: Since In Training items stack, carrot isn't as cost-effective as just buying apples. The apple comes to 1exp/$150, and the carrot is 1exp/$166ish.
The pathing is beyond frustrating, at least make it so the penguin picks a different target or SOMETHING after a few seconds of nothing but wall. That way it would only happen if there's only like, one left.
His parents are obviously cool with him wrecking stuff. I mean, they can afford a cannon and all sorts of specialized ammunition, I'm sure they can replace a few TV sets.