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General Operating Instructions
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 To compute √ (32 + 42),
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Calculating Percentage Problems
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To avoid confusion relative to percentage problems, the following terms
are defined in accordance with those most commonly used by the business
community:
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When finding a fractional part of a given number, the number is called the base, the fractional part is called the rate or percent, and the result is
called the percentage. When adding the percentage to, or subtracting it from, the base, the result is called the net amount.
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The HP-80 simplifies the calculation of percentage problems because you don’t have to convert percents to their decimal equivalents before using them; just press
the % key after keying in the percent value. Three types of percentage problems are handled:
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Finding percentage of number (base × rate)
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Finding net amount (base + or – percentage)
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Finding percent difference between a number and the base (number – base) ÷ base
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Finding Percentage: To find the percentage of a number, enter the base number and press SAVE . Then enter the percent, press %. For example, to
find 14% of $300,
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| | Enter: | | | See Displayed: | | |
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percentage
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Finding Net Amount: An additional feature is that after finding
the percentage, the HP-80 still contains the original base number from
which you may calculate the
net amount (such as base price plus tax, or list price less discount) by simply pressing a + or –, respectively.
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