What is the conclusion of double fudge?

"Double Fudge" is a humorous children's novel by Judy Blume that concludes with the Hatcher family finding a way to accommodate Fudge's obsession with money by starting a currency collection. They also plan a family trip to Hawaii using some of the money Fudge has saved. The story ends on a positive note with the family coming together and finding a solution to Fudge's latest obsession.