Definition of "twenny"

Ah, ya ain't worried bouta a lousy twenny cents are ya? Mean to say, it ain't gonna bust ya is it? Ah, Missa Jake, price on board say five dollah twenny. Price not go down. When it does, we change up on board.

1990, Alan Duff, Once were warriors

He's got rait good trainers, he buys 'is own trainers, 'is got a paper rahnd, he gets twenny-odd quid a week, I think he gets twenny three, he 'as three quid an' his Mum teks twenny quid off'im.

2000, Simon J. Charlesworth, A phenomenology of working class experience, page 128

He paid me twenny bucks ta swap out with him.Twenny bucks? That wuzz a lot.

2006, Les Standiford, Miami Noir, page 264