710                                                    21

           2%  
    .  , $1000    -
 $1020  12       $102 980 ($100 000 +
+ $4000 - $1020).

      (     -
 )    (     $1020).   
      :

^.=^+1-.                                 (21.3)

  ,        
          -
,    ,       -
  .

31.7.4     

 ,           $100?
     ?      
  ,    , -      
,    .     -
     ,     -
   .       $102 980 -
    $100   $103 080.     
 (   $100),     :

P-=P,+f-B+C.                                     (21.4)

          
(1   + )    (cost of cany)   . -
   ,     ,    
,         .

 ,       .  -
           -
  ? .       ,
       
      .     -
     ,   ,    
  .

 

 70-       
   .        
      ,  
     .      -
    ,      
.      ,   
        ,  -
      . ( -
        .)