(payback period method ) .
, , , , :
(3.4)
ny .
payback period , , . , .
PP. nok () 쳺 , , , :
t .
, 1.5:
, (3.5)
,
, .
IRR
, IRR (internal rate of return).
- . , , () cost of capital , .
( ), , NPV > 0 NPV = 0, , NP V > 0. , .
IRR , .
V 1 < V 2, , V 1... V 2 NPV = f (V) + , . :
(3.6)
- , NPV ;
- , NPV ;
- ;
- .