Answer:
The correct answer is Greg. He is the agent. 
Explanation:
First of all, the term <em>agent</em>, in business, is understand as the individual that currently <em>manages another person's business affairs</em> and that commonly spend much of his time negotiating contracts for his clients.
Secondly, according to the definition of agent, it is understandable that in this case the agent is Greg due to the fact that he is the one that has to sell the collection, under Michael's orders. 
 
        
             
        
        
        
Answer
The answer and procedures of the exercise are attached in the following archives.
Explanation  
You will find the procedures, formulas or necessary explanations in the archive attached below. If you have any question ask and I will aclare your doubts kindly.  
 
        
             
        
        
        
2
In numerical form on the left and written out on amount line
        
                    
             
        
        
        
Answer:
unrealized gain from change in market value = $10,617
Explanation:
Bonds carrying value = $739,816
amortization of bond discount = ($739,816 x 6%) - ($800,000 x 5.5%) = $389
amortization of bond discount = ($740,205 x 6%) - ($800,000 x 5.5%) = $412
bond's carrying value = $740,205 + $412 = $740,617
unrealized gain = carrying value - market value = $740,617 - $730,000 = $10,617