51
Con
ver
sion between APR and EFF
Interest r
ates can be con
v
e
rted betw
een APR (ann
ual, or nomi-
nal percentage r
ate) and EFF (eff
ectiv
e interest r
ate).
•
The APR is an in
v
estment’
s ann
ual r
ate of interest when com-
pounding happens only once a y
ear
. The interest r
ate pr
inted
on a bond is an e
xample of an APR.
•
The EFF is an in
v
estment’
s ann
ual r
ate of interest when com-
pounding happens more often than once a y
ear
. It refl
ects the
actual amount of retur
n f
or a giv
en nominal r
ate
. F
or e
xample
,
if y
our in
v
estment compounds monthly
, then the stated nomi-
nal percentage r
ate becomes a monthly r
ate
, and the EFF
refl
ects y
our actual ann
ual r
ate of retur
n.
Basic operations
1.
Press
s
to clear the displa
y. Mak
e sure the calculator is
in NORMAL mode
.
2.
Enter the calculation data in the f
ollo
wing f
o
rmat:
•
T
o
c
hang
e APR to EFF:
Number of compounding per
iods per y
ear
>
Nominal
percentage r
ate
.
P
•
T
o
c
hang
e EFF to APR:
Number of compounding per
iods per y
ear
>
Eff
ectiv
e
interest r
ate
.
!
Con
ver
ting between APR and EFF
Pr
ocedure
K
e
y
operation
Displa
y
Calculate the
eff
ectiv
e interest
rate f
or tw
elv
e
compounding
per
iods with an
18% APR.
s
12
>
18
.
P
12,18¬EFF
1956
Con
v
e
rt
this r
ate
bac
k to the or
igi-
nal APR.
12
>
19.56
.
!
12,19.56¬APR
1800
3 Financial FunctionsCurrent.indd 51
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