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Introduction
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Here are some other problems you can solve that are just as easy with the HP-80 (and just as tedious with conventional methods):
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All types of simple and compound interest calculations
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All types of percentage calculations
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Statistical applications (mean and standard deviation)
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All types of present value, future value, and effective rate calculations
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Sum-of-the-digits amortization (finance charges, depreciation)
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Add-on interest to effective annual rate conversion
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Effective yield calculations
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Mortgage calculations
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Discounted cash flow analyses
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Bond price and yield-to-maturity calculations
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Time interval, future date calculations
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Linear regression analysis (trend line forecasting) applications
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Square root calculations
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In addition to its more exotic features, the HP-80 is fast, accurate, and convenient to use. It handles numbers as small as 10–09 (that’s a decimal point followed by 98 zeros and a 1), and numbers as large as 1099 (1 followed by 99 zeros),
automatically places the decimal point, and allows you to round the
display to settings ranging from zero to six decimal places. It does
everything a conventional four-function desk calculator does, too.
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Unlike Charles Lamb, HP-80 users may never produce works of art as an
outlet for job-related frustration. They may have to settle for
something more modest—say president of the World Bank?
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