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Appendix
3. FV calculation
1 If r ≠ 0, r > -1
1
–
(1
+
r)
-
n
r
PV
+
(1
+
r
×
s)
×
×
PMT
(1
+
r)
-
n
FV =
–
2 If r = 0
FV = -n × PMT – PV
3 If r ≤ -1
Error
4. PMT calculation
1 If r ≠ 0, r >
-1
1
–
(1
+
r)
-
n
r
PMT =
–
(1
+
r
×
s)
×
PV
+
FV
×
(1
+
r)
-
n
2 If r = 0
PMT = –
PV + FV
n
3 If r ≤ -1
Error
5. N calculation
1 If r ≠ 0, r >
-1
log (1
+
r)
log
N =
–
1
r
×
(1
+
r
×
s)
×
PMT
–
FV
1
r
×
(1
+
r
×
s)
×
PMTPV
+
{}
2 If r = 0
N = –
FV + PV
PMT
3 If r ≤ -1
Error