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HP 10bII+ User Manual Page 168

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Time Value of Money (TVM)
Payment Mode Factor: S = 0 for End mode; 1 for Begin mode.
Amortization
ΣINT = accumulated interest
ΣPRN = accumulated principal
i = periodic interest rate
BAL is initially PV rounded to the current display setting.
PMT is initially PMT rounded to the current display setting.
For each payment amortized:
INT'
BAL × i (INT' is rounded to the current display setting;
=
INT' = 0 for period 0 in Begin mode.)
INT = INT' (with sign of PMT)
PRN = PMT + INT'
BAL
= BAL
new
old
ΣINT
= ΣINT
new
ΣPRN
= ΣPRN
new
Interest Rate Conversions
II
Appendix B: More About Calculations
i%
1
=
+
+
0
PV
---------------
100
+
+ PRN
+ INT
old
+ PRN
old
EFF%
=
1
I/YR
i%
------------ -
=
P/YR
i%
1
1
+
--------
100
×
S
×
×
------------------------------------- -
PMT
i%
------- -
100
i%
N
×
FV
1
+
------- -
100
I YR
i
=
-----------------------------
×
P YR
100
P YR
NOM%
×
1
+
-----------------------------
×
100
P YR
N
100

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