英语阅读The lost purseA lady lost her handbag in the bustle of C

英语阅读
The lost purse
A lady lost her handbag in the bustle of Christmas shopping.It was found by an honest little boy and returned oher.Looking in her purse ,shecommented,"HMMM...That's funny.When I lost my bag there was a $20bill in it.Now there aer twenty $1 bills.”The boy quickly relied,"That's right,lady.The last time Ifound a lady's purse,she didn't have any change for a reward."
1What's in the purse?
2Why did the boy re piace twenty $1bills with a $20bill?