Perl/CGI Loan Payment
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Other links at CGI and Perl > Scripts and Programs > Calculators
Free Engineering Software Website (FESW). This website has on-line analytical tools and an archive of free PERL programs designed for use on the World Wide Web via the Common Gateway Interface (CGI). These programs are designed to solve mechanical engineering problems in areas such as thermodynamics, fluid mechanics, economics, and units conversions. I have released some of these programs to the public domain in hopes that it will generate interest in the broader use of the web - particularly by engineers. I believe that we as engineers have not yet recognized the full potential that the web offers. Hopefully, this website will offer some glimpse of the possibilities.
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AffordaBilly is a simple interest loan calculator, similar to "VeryInteresting" but focused on determining how large a loan the user can afford, given an interest rate and length of the loan in years. Users can choose monthly or bi-weekly payments. The results will show the maximum amount of a loan that the user can afford based on the monthly payment and interest rate. This is a very simple, yet nice educational tool for showing just how much only 1 or 2% interest can make a difference over the course of time. I think it's cool to have students calculate the loan they can afford with a monthly payment, then have them cut that in half and choose "Bi-Weekly". For example, over the course of a 30-year loan at 7% interest, a Bi-Weekly payment of 325 will let you afford about ,000, whereas a Monthly payment of 650 will only let you afford ,000. Take the interest from 7% to 8% over the same term, and you can only afford about ,000. And students wonder why they should care about interest rates and other math stuff? :-) AffordaBilly is a blatant ripoff of the VeryInteresting payment calculator, also available for download from this site.
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This script lets your users enter their information to receive your offers by email. They can choose between multiple lists or just one. Unsubscribing is also automatic. Using MySQL as the database allows the management of millions of contacts. Bulk mail and export to text or CSV files is included. An administration page for the webmaster makes management simple. Installation is easy and the sign-up page can be customized to integrate seemlessly in your site.
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PayBackTime is a simple perl/CGI interest loan calculator, similar to "VeryInteresting" and "AffordaBilly" but focused on determining how long it will take to pay off a loan or credit card, given a minimum payment, balance, and interest rate. The results will show the time it will take to pay off the balance with that monthly payment, number of payments, and the total interest the user will end up paying. For illustration purposes, it also shows the same data based on a bi-weekly payment of half the amount of the monthly payment. This is another very simple, yet nice educational tool for showing just how much only a few dollars a month can decrease the time to pay off a balance, and for showing just how much you pay for the privilege of using a credit card and paying the minimum payment. Most people simply don't think about how much they're paying, and this is a nice illustration. Students I've shown this to (and not just students, but most people) are often amazed at both the length of time it will take to pay the balance off, and by the amount of interest they will pay. PayBackTime is a blatant ripoff of the VeryInteresting payment calculator, also available for download from this site.
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The script was originally designed to help teachers analyse their student marks.
Many teachers keep marks in spreadsheets, but don't have the time or expertise to insert formulas to perform all the statistical calculations.
Statistical calculator allows users to simple copy and paste their data, then calculate and print the statistics.
It is useful, particulary for moderation purposes where many teachers teach the same subject across a year level & for feedback purposes to students and parents.
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