### NOTAX: An interactive compound interest calculator.

This is a general purpose function that does not explicitly include income tax effects. Use the function TAXABLE for determining taxes and after tax income. NOTAX illustrates a basic proceedure for time value, investment decision, and Engineering Economy types of analysis. It is interactive and requires input of key variables.

NOTAX is designed to illustrate a technique for making the calculations needed to determine comparative values.

Begin NOTAX from the STEPS MENU or by going to APL Immediate Execution, then by entering NOTAX 0:

NOTAX requires that you choose the answer, i.e. decision var. from the following:

• P = Present Value (Worth),
• F = Future Value,
• A = Annuity (i.e. Amount of an Equivalent Uniform Serie),
• i = the interst or discount rate (as a decimal fraction, not as a percentage)
• n = the number of accounting periods

The major inputs are lists of:

• RECEIPTS: R = (positive cash flows) at times 0 1 2, ,, ,n.
• DISBURSMENTS: D = (negative cash flows) at times 0 1 2, ,, ,n.
• Note: 0 should be used to indicate no cash flow.

These are algebraically summed to the CASHFLOW (value) vector C.
Use APL, or APL like expressions to ease data entry. See lesson below.
R and D must eventually include one entry for each period.
A single D payment may be used at time 0, additional 0's are automatic.

Interest (i.e. discount) rates may be entered as decimals for periods or annually. Period rates are converted to effective annual rates depending on the number of periods per year. Use decimal FRACTION, not PERCENTAGE RATES.

A Report is produced and can be saved in the LOG as required.
If the function fails or you wish to restart exit by [Ctrl Esc] (DOS only). Restart on one of the restart lines or use NOTAX 0 in APL immediate execution.

Go to MYSYS TVX workspace to use NOTAX.(If you have started TVX before starting the browser for viewing this note you can use [Alt Tab] to switch if you are in Windows95).