Final answer:
The fair value of Company X bonds at year-end cannot be determined from the provided information without additional context linking fair values to specific securities.
Step-by-step explanation:
The question pertains to the evaluation of fair value of Company X bonds at the end of the year based on the provided financial information of the Stoll Company's long-term available-for-sale portfolio. Based on the data provided, the fair values at December 31 for the securities are mentioned as follows: B $82,300, C $603,800, $120,000, and $276,000. In the context of the question, these values correspond to different securities, and the fair value of Company X bonds at the end of the year that was purchased on July 6 for $122,100 is stated as one of these amounts. To determine which of these amounts corresponds to the Company X bonds, we would need additional information specifying which label (B, C, etc.) refers to which security since it is not provided in the question. However, since Company X bonds are not mentioned explicitly in the list, we cannot definitively determine the fair value at year-end without further clarification.