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HP 12c Manual

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Apéndice D: Fórmulas utilizadas 185
File name: hp 12c_user's guide_Spanish_HDPMBF12S31 Page: 185 of 208
Printered Date: 2005/7/29 Dimension: 14.8 cm x 21 cm
Análisis de flujos de caja descontados
Valor neto actual
NPV = valor neto actual de un flujo de caja descontado.
CF
j
= flujo de caja en el período j.
n
n
i
CF
i
CF
i
CF
CFNPV
)1(
...
)1(
)1(
2
2
1
1
0
+
++
+
+
+
+=
Tasa interna de rendimiento
n = número de flujos de caja.
CF
j
= flujo de caja en el período j.
IRR = tasa interna de rendimiento.
0
1
)1(
)1(1
0 CFIRR
IRR
IRR
CF
jq
j
nq
k
j
n
j
+
⎥
⎦
⎤
⎢
⎣
⎡
+⋅
⎥
⎥
⎦
⎤
⎢
⎢
⎣
⎡
+−
⋅=
∑
−
=
−
<
∑
Calendario
Sobre una base de días reales
∆
DYS = f(DT
2
) – f(DT
1
)
donde
f(DT) = 365 (aaaa) + 31 (mm – 1) + dd + INTG (z/4) – x
y
si mm
≤
2
x = 0
z = (aaaa) – 1
si mm > 2
x = INTG (0,4mm + 2,3)
z = (aaaa)
INTG = parte entera.
Nota:
Se realizan pruebas adicionales para asegurar que los años del siglo
(pero no el milenio) no son considerados bisiestos..
Sobre una base de 30/360 días
DAYS = f(DT
2
) – f(DT
1
)
f(DT) = 360 (aaaa) + 30mm + z
si f(DT
1
)
si dd
1
= 31 entonces z = 30
si dd
1
≠
31 entonces z = dd
1
si f(DT
2
)
si dd
2
= 31 entonces dd
1
= 30 o 31 entonces z = 30
si dd
2
= 31 entonces dd
1
< 30 entonces z = dd
2
si dd
2
< 31 entonces z = dd
2
… 185 …


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