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At the end of the week, YingEn checked her wallet and saw she had $36.42. She recalled that on Thursday Jennifer had given her $5 for a book, but that later that same day, Jeffrey had borrowed $3 for a soda. She also remembered that at the start of the week, she had given her best friend half of the money she had at that time. How much money did YingEn have at the beginning of the week?