Joseph is a student in Prof. Yoon's business law class. Joseph is a smart student who has done well on his exams, but he knows that he is likely to get bad grade because of his excessive absences and his disrespectful behavior in class. Prof. Yoon always stresses the importance of the attendance and respectful behavior in class and warns students that these factors will influence the final grade a lot. One day near the end of the semester, Joseph hears from other students that Prof. Yoon is selling his business law textbook. A used business law textbook normally costs $10 to $80. Joseph offers to buy the book. from Prof. Yoon for $500. Prof. Yoon is so happy and accepts the offer. Prof. Yoon hands the book immediately to Joseph and Joseph gives $500 cash to Prof. Yoon. Furthermore, Prof. Yoon and Joseph write an agreement memorializing this transaction and sign the agreement.In that agreement, they explain how all four elements of contract are satisfied for this transaction. A few weeks later, Joseph receives a D+ as his final grade from Prof. Yoon. Joseph is very upset and goes to Prof. Yoon and demands all his money back claiming the book was overpriced. If Joseph takes Prof. Yoon to court, how will the court rule? use and apply all the relevant legal principles.