You should limit the value of any contribution of a fully depreciated asset to a reasonable use charge. In determining what is reasonable, you must consider:
    
    
        
        (a) 
         The original cost of the asset;
     
    
        
        (b) 
         Its estimated remaining useful life at the time of your negotiations;
     
    
        
        (c) 
         The effect of any increased maintenance charges or decreased performance due to age; and
     
    
        
        (d) 
         The amount of depreciation that the participant previously charged to Federal awards.