We provide a variety of stand
alone tools for assisting computation in the lessons. Individual
tools as well as a toolbox of several tools are presented in
a colored field with the hammer or tool icon
on the left. Clicking the icon opens a window showing the tool.
The toolbox is illustrated below. This sections discusses each
of the individual tools.

Use
the tools provided for calculations on homework exercises.
They may not be available for examinations. 



Factor Tables 

The traditional way to evaluate equivalence factors is through
tables. A single table holds the factors for a specified interest
rate for a collection of time intervals. The figure below shows
an example of the 10% table. To look up a factor value for a
given number of periods n, choose the row for that value
of n and the column for the desired factor. The factor
value is at the intersection of the row and column. For example,
the value of (P/F, 0.1, 10) is read as 0.3855.
Click on the tool icon to open a table
of interest rates. Clicking on a rate will open a PDF document
with table for that interest rate.


Calculator 

A standard calculator prepared in Flash was downloaded
from the web. The author is shown on the display.


Factor Calculator 

This calculator computes equivalency factors
for arbitrary parameters. This calculator is very handy for simple
problems. Enter the interest
rate and the time interval in the data fields and click on a
factor button to perform the computation. The multiplier data
field is available for simple problems requiring multiplication
of the factor by a constant. The calculator is programmed with Flash and
is interactive.
Click on the tool icon to open the factor
calculator.


Cash Flow
Calculator 

This calculator computes the present worth,
uniform worth and future worth for problems that have no more
than 10 periods. Individual cash flow amounts must be integers
between 99 and +99. Period entries must be positive integers.
Enter the cash flow and press the enter button. The
calculator is programmed in Flash.
Click on the tool icon to open the cash
flow calculator.


Project Calculator 

The inputs to the Project Calculator are the
separate components of a complicated cash flow. Components may
be single payments, uniform series and gradient series. Up to
ten components may be entered. Cash flow amounts are any positive
or negative numbers. The project life (duration) is
an integer. The MARR is an integer percentage. For a single
payment, the start field
tells when the payment occurs. For a uniform series payment,
the start field indicates when the first payment occurs,
and the end field indicates when the last payment occurs.
For the gradient series, the start field indicates
when the first nonzero payment occurs and the end field
indicates when the last payment occurs. Note that this is a little
different than the gradient series described in the equivalency
lesson.
The calculator is programmed in Flash and it
takes a little while to download and open. Click on the tool icon
to open the project calculator.


Normal Cumulative 

To compute probabilities of random variables
with Normal distributions it is useful to have a table of the
Standard Normal Cumulative distribution. Click
the icon to open a window with a table.


Normal Cumulative 

To compute a number for which the cumulative
distribution has a specific value use the Standard Normal
Inverse table.


Random Numbers 

For exercises involving simulation, it is handy
to have a Random Number table.

