HP·38E/38C - Slide Rule Museum
HP·38E/38C - Slide Rule Museum
HP·38E/38C - Slide Rule Museum
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20 Using Your Calculator<br />
Example: If the sales tax on a $6,200 car is 5%, what is the amount of<br />
the tax and total cost of the car?<br />
Keystrokes<br />
6200 [ErmA. I<br />
500<br />
Display<br />
6,200.00<br />
310.00<br />
6,510.00<br />
Enter base amount.<br />
Percentage amount (sales<br />
tax).<br />
Net amount (base plus<br />
percentage amount) .<br />
Percent Difference Between Two Numbers [l>% I<br />
To find the percent difference between two numbers, i.e., the ratio of<br />
increase or decrease:<br />
1. Key in the first number (old value).<br />
2. Press [ENTER. I to separate the first number from the second.<br />
3. Key in the second number (new value).<br />
4. Press QJ[l>%1<br />
Example: Your rent jumps from $285 a month to $335 a month. What<br />
percent is the increase?<br />
Keystrokes<br />
285 [ErmA. I<br />
335 QJ[l>% I<br />
Display<br />
17.54 % increase.<br />
Example: You forgot to place a stop order and your stock fell from<br />
$57.50 to $13.25 a share. What percent is the decrease?<br />
Keystrokes<br />
57.50 [ErmA. I<br />
13 .25 QJ[l>%1<br />
Display<br />
-76.96 % decrease.<br />
Retail calculations for markup and margin are simple percentage<br />
problems using the [l>% I function. For example, to calculate the markup<br />
of an item based on the wholesale or original purchase cost, enter the<br />
purchase cost, then key in the selling price and press QJ[l>% I . To
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