Sharp el-9950

237
Appendix
5. Error Conditions Relating to Specific Tasks
1. Financial
*Deneconstants“r”and“s”asusedintheequationbelow.
r =
S = 1 (Pmt_Begin)
S = 0 (Pmt_End)
(
{}
)
C/Y + 1 – 1 ,
I (%)
100
C/Y
P/Y
1. I% calculation
1
IfPMT=0
r = – 1-
()
1
n
-
PV
FV
2
IfPMT
≠
0
f(r)=PV
+
(1
+
r
×
s)
×
PMT
×
1
–
(1
+
r)
-n
r
+
FV(1
+
r)
-
n
: (r
≠
0)
f(r)=PV
+
PMT
×
n
+
FV:(r=0)
calculate the following for r solved in
1
and
2
I(%)=100
×
C/Y
×
((r
+
1)
P/Y
C/Y
–
1)
2. PV calculation
1
If r
≠
0, r >
-
1
PV=
-
(1
+
r
×
s)
×
1
–
(1
+
r)
-n
r
×
PMT
–
FV
×
(1
+
r)
-
n
2
If r = 0
PV=
-
n
×
PMT
–
FV
3
If r
≤
-
1
Error