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21
Compound interest
This calculator assumes interest is compounded per
iodically in
fi nancial calculations (compound interest).
Compound inter-
est accum
ulates at a predefi
ned r
ate on a per
iodic basis
. F
or
e
xample
, mone
y deposited in a passbook sa
ving account at
a bank accum
ulates a cer
tain amount of interest each month,
increasing the account balance
. The amount of interest receiv
ed
each month depends on the balance of the account dur
ing that
month, including interest added in pre
vious months
. Interest
ear
ns interest, which is wh
y it is called compound interest.
It is impor
tant to kno
w the compounding per
iod of a loan or
in
v
estment bef
ore star
ting, because the whole calculation is
based on it.
The compounding per
iod is specifi
ed or assumed
(usually monthly).
Cash fl
o
w
dia
grams
The direction of arro
ws indicates the direction of cash mo
v
ement
(infl
o
w
and outfl
o
w) with time
. This man
ual uses the f
ollo
wing
cash fl
o
w
diag
rams to descr
ibe cash infl
o
ws and outfl
ow
s.
P
a
yment (PMT)
......
Inflo
w (+)
Cash
flo
w
Present
v
alue (PV)
Future
v
a
lue (FV)
Time
Outflo
w (–)
3 Financial FunctionsCurrent.indd 21
06.7.10 8:38:12 PM