aunt polly rewards tom for a job well done and how does tom also reward him self

Aunt Polly rewards Tom with free time.

"But it's power- ful seldom you're a mind to, I'm bound to say. Well, go 'long and play; but mind you get back some time in a week, or I'll tan you."

Tom rewards himself with a donut.

And while she closed with a happy Scriptural flourish, he "hooked" a doughnut.