Chapter 4: Time Value of
Money
Objective
Explain the concept of compounding
and discounting and to provide
examples of real life
applications
1
Copyright, 2000 Prentice Hall ©Author Nick Bagley, bdellaSoft, Inc.
Value of Investing $1
– Continuing in this manner you will find that
the following amounts will be earnt:
1 Year
$1.1
2 Years
$1.21
3 Years
$1.331
4 Years
$1.4641
2
Value of $5 Invested
• More generally, with an investment of $5
at 10% we obtain
1 Year
$5*(1+0.10)
$5.5
2 years
$5.5*(1+0.10)
$6.05
3 years
$6.05*(1+0.10)
$6.655
4 Years $6.655*(1+0.10)
3
$7.3205
Future Value of a Lump Sum
FV = PV * (1 + i )
n
FV with growths from -6% to +6%
Future Value of $1000
3,500
6%
3,000
2,500
4%
2,000
1,500
2%
1,000
0%
-2%
-4%
-6%
500
0
0
2
4
6
8
4
10
Years
12
14
16
18
20
Example: Future Value of a
Lump Sum
• Your bank offers a
CD with an interest
rate of 3% for a 5
year investments.
• You wish to invest
$1,500 for 5 years,
how much will your
investment be
worth?
5
FV = PV * (1 + i )
n
= $1500 * (1 + 0.03) 5
= $1738.1111145
n
i
PV
FV
Result
5
3%
1,500
?
1738.911111
Present Value of a Lump Sum
FV = PV * (1 + i )
n
Divide both sides by (1 + i ) to obtain :
FV
−n
PV =
= FV * (1 + i )
n
(1 + i )
n
6
Example: Present Value of a
Lump Sum
• You have been
offered $40,000 for
your printing
business, payable in
2 years. Given the
risk, you require a
return of 8%. What
is the present value
of the offer?
7
FV
PV =
(1 + i ) n
40,000
=
(1 + 0.08) 2
= 34293.55281
≅ $34,293.55 today
Solving Lump Sum Cash Flow
for Interest Rate
FV = PV * (1 + i ) n
FV
= (1 + i ) n
PV
FV
n
(1 + i ) =
PV
FV
n
i=
−1
PV
8
Example: Interest Rate on a
Lump Sum Investment
• If you invest $15,000
for ten years, you
FV
n
i
=
−1
receive $30,000.
PV
What is your annual
30000
10
=
− 1 = 10 2 − 1 = 2 − 1
return?
15000
1
10
= 0.071773463
= 7.18% (to the nearest basis point)
9
Review of Logarithms
• The basic properties of logarithms that
are used by finance are:
e
= x, x > 0
ln( x )
ln(e ) = x
ln( x * y ) = ln( x) + ln( y )
x
ln( x ) = y ln( x)
y
10
Review of Logarithms
• The following properties are easy to
prove from the last ones, and are useful
in finance
ln( x / y ) = ln( x) − ln( y )
ln( x * y * z ) = ln( x) + ln( y ) + ln( z )
ln( x + y ) ≠ ln( x) * ln( y )
11
Solving Lump Sum Cash Flow
for Number of Periods
FV = PV * (1 + i ) n
FV
= (1 + i ) n
PV
FV
n
(
)
ln
=
ln
(
1
+
i
)
= n * ln (1 + i )
PV
FV
ln
PV ln ( FV ) − ln ( PV )
n=
=
ln (1 + i )
ln (1 + i )
12
Effective Annual Rates of an
APR of 18%
Annual
Percentage
rate
18
Frequency of
Annual
Compounding Effective Rate
1
18.00
18
2
18.81
18
4
19.25
18
12
19.56
18
52
19.68
18
365
19.72
13
The Frequency of
Compounding
• Note that as the frequency of
compounding increases, so does the
annual effective rate
• What occurs as the frequency of
compounding rises to infinity?
km m
EFF = Lim 1 + − 1 = e k∞ − 1
m →∞
m
14
The Frequency of
Compounding
m
k
1 + EFF = 1 + m
m
1
km
m
1+
= (1 + EFF )
m
(
)
k m = m * (1 + EFF ) − 1
1
m
15
The Frequency of
Compounding
Annual
Compounding
Effective Rate Frequency
12
1
Annual
Percentage
Rate
12.00
12
2
11.66
12
4
11.49
12
12
11.39
12
52
11.35
12
365
11.33
12
Infinity
11.33
16
Derivation of PV of Annuity
Formula: Algebra. 1 of 5
pmt
pmt
PV =
+
+
1
2
(1 + i ) (1 + i )
pmt
pmt
pmt
++
+
3
n −1
n
(1 + i )
(1 + i )
(1 + i )
17
Derivation of PV of Annuity
Formula: Algebra. 2 of 5
1
1
PV = pmt *{
+
+
1
2
(1 + i ) (1 + i )
1
1
1
++
+
}
3
n −1
n
(1 + i )
(1 + i )
(1 + i )
18
Derivation of PV of Annuity
Formula: Algebra. 3 of 5
1
1
PV * (1 + i ) = pmt * (1 + i ) *{
+
+
1
2
(1 + i ) (1 + i )
1
1
1
++
+
}
3
n −1
n
(1 + i )
(1 + i )
(1 + i )
19
Derivation of PV of Annuity
Formula: Algebra. 4 of 5
1
1
+
+
0
1
(1 + i ) ( 1 + i )
1
1
1
1
1
++
+
+[
−
]}
2
n−2
n −1
n
n
(1 + i )
(1 + i )
(1 + i )
(1 + i ) (1 + i )
1
1
= pmt *
+ pmt *{
+
0
1
(1 + i )
(1 + i )
1
1
1
1
1
+
+
+
+
}
−
pmt
(1 + i ) 2
(1 + i ) n−2 (1 + i ) n−1 (1 + i ) n
(1 + i ) n
PV * (1 + i ) = pmt *{
20
Derivation of PV of Annuity
Formula: Algebra. 5 of 5
1
1
PV * (1 + i ) = pmt *
+ PV − pmt
0
n
(1 + i )
(1 + i )
1
PV * (1 + i ) + PV = pmt − pmt
n
(1 + i )
1
pmt *{1 −
}
n
pmt
1
(
1+ i)
PV =
=
* 1 −
n
i
i (1 + i )
21
PV of Annuity Formula
pmt *{1 −
PV =
1
}
n
(1 + i )
i
pmt
1
=
* 1 −
n
i (1 + i )
22
PV Annuity Formula: Payment
PV =
pmt
1
* 1 −
n
i (1 + i )
(
pmt
−n
=
* 1 − (1 + i )
i
PV * i
pmt =
−n
1 − (1 + i )
(
23
)
)
PV Annuity Formula: Number
of Payments
(
)
pmt
−n
PV =
* 1 − (1 + i ) ;
i
(1 + i )
−n
(1 + i ) − n
PV * i
−n
= 1 − (1 + i )
pmt
PV * i
PV * i
= 1−
; − n * ln(1 + i ) = ln1 −
pmt
pmt
PV * i
ln1 −
pmt
PV * i
= 1−
; n=−
pmt
ln (1 + i )
24
Annuity Formula: PV Annuity
Due
PVdue = PVreg * (1 + i )
pmt
−n
*{1 − (1 + i ) } * (1 + i )
i
pmt
1− n
=
*{(1 + i ) − (1 + i ) }
i
=
25