Time Value of Money Calculations 79
Interest Rate Conversions
The Interest Conversion application uses three keys:
\Ó
,
\Ð
, and
\Í
. They convert between nominal and annual effective interest rates.
If you know an annual nominal interest rate and you wish to solve for the corresponding
annual effective rate:
1. Enter the nominal rate and press
\Ó
.
2. Enter the number of compounding periods and press
\Í
.
3. Calculate the effective rate by pressing
\Ð
.
To calculate a nominal rate from a known effective rate:
1. Enter the effective rate and press
\Ð
.
2. Enter the number of compounding periods and press
\Í
.
3. Calculate the nominal rate by pressing
\Ó
.
In the TVM application,
\Ó
and
Ò
share the same memory.
Interest conversions are used primarily for two types of problems:
•
Comparing investments with different compounding periods.
•
Solving TVM problems where the payment period and the interest period differ.
Investments With Different Compounding Periods
Example: Comparing Investments
You are considering opening a savings account in one of three banks. Which bank has the
most favorable interest rate?
First
Bank
First Bank
6.70% annual interest, compounded quarterly
Second Bank
6.65% annual interest, compounded monthly
Third Bank
6.63% annual interest, compounded 360 times per year
Table 6-23 Calculating the interest rate (First bank)
Keys
Display
Description
S7j\Ó
6.70
Stores nominal rate.
Y\Í
4.00
Stores quarterly compounding
periods.
Содержание 10bII+
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