Who won the bet between even and Jessie in lemonade war?

In "The Lemonade War" by Jacqueline Davies, the bet between Evan and Jessie ultimately results in Jessie winning. They each set out to sell lemonade, and while Evan initially has some success, Jessie's determination and strategic approach lead her to outsell him by the end of the competition. This outcome emphasizes themes of competition, sibling rivalry, and the importance of perseverance.