74
Depreciation calculations
ROUND(NUM): If a display notation tab
setting has been chosen, NUM is rounded and
truncated to the specifi ed number of places
after the decimal point.
In the following equations, M01 = START
MONTH, LIF = LIFE(N), CST = COST(PV),
SAL = SALVAGE(FV), and DB = DB(I/Y).
Straight-line method (SL)
Calculations
If 1 < n < end_year then
Results
Sum-of-the-years’ digits method (SYD)
Calculations
Results
Declining balance method (DB)
Calculations
Results
Error
CST < 0
SAL < 0
CST < SAL
LIF: when SL, LIF
d
0
when SYD or DB, LIF is not a positive
integer
I/Y < 0 (DB only)
Conversion between
APR and EFF
N
,
EFF
¬
APR
(( + 1) –1) N 100
EFF
100
1
N
Error
EFF
d
–100
N
,
APR
¬
EFF
(( + 1) –1) 100
APR
N
100
N
Error
≤ –100
APR
N
Day and date calculations
In day and date calculations, this calculator
conforms to rules set up in the book titled Stan-
dard Securities Calculation Methods, by Jan
Mayle, Securities Industry Association, 1993.
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