556                                                    18

   ,    ,     
   :

'   D,         D^ 1

^r-+^=?+-l       (18.27)

,=i(l+k)'   (k-gX^l+k)7
     ,   (18.27), -
  . 18.1.



   ,      DDM, -
,   Magnesium     $0,75  .
   ,  Magnesium      $2
 .  , g^ = (, - D^/Dy = ($2 - $0,75)/$0,75 = 167%.  
    $3   , , g, = (D.  D)/D. = ($3 
 $2)/$2 = 50%.     ,  ,   
       10%  , .. = 2  g = 10%.
 , Z)^ ,=7)3= $3(1 + 0,1) = $3,30.     -
    Magnesium  15%  _  V^   -
  :

^- = $2 + $3 = $4,01;

(1+0,15)'    (1+0,15)2

^         $3-30         =$49.91.
(0,15-0,10) (1+0.15)2

  V^.  V^  V,  $4,01 + $49,91 = $53,92.  ,
   $55  .  ,  
Magnesium   ,    V   .

18.4.2     

           
,         -
    .  ,      ,
  (18.15), (18.156), (18.23)  (18.236),  . 
,     IRR ,    (18.27)  V
   k  k*:

 V   D'   ,      ^

:=!^-+7-               <18-28)

,=i(l+k*)'   (k*-g)(l+k*)r

       k*.

   .    IRR    -
     .    (18.28) 
   ,   k*   
 . ,    k*,    -
   (18.28).    -  -
  k*.       (18.28)  ,
     k*. ,    
,     k*.    ,  