HP 12c Owners Manual

  Section 1: Getting Started  21 
 
File name: hp 12c_users guide_English_HDPMBF12E44  Page: 21 of 209   
Printered Date: 2005/7/29    Dimension: 14.8 cm x 21 cm 
 
Keystrokes Display  
- 
21.68 Pressing -
 subtracts the number just 
entered from the number previously in 
the display. The calculator displays the 
result of this calculation, which is the 
balance after subtracting the second 
check. 
10.14- 
11.54 Keys in the next number and subtracts 
it from the previous balance. The new 
balance...

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Your hp 12c calculates the answer in just the same way: 
Keystrokes Display  
3\4§ 
12.00 Step 1: Multiply the numbers in the 
first parentheses. 
5\6§ 
30.00 Step 2: Multiply the numbers in the 
second parentheses. 
+ 
42.00 Step 3: Add the results of the two 
multiplications. 
Notice that before doing step 2, you did not need to store or write...

  Section 1: Getting Started  23 
 
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Storage Registers 
Numbers (data) in the hp 12c are stored in memories called “storage registers” or 
simply “registers.” (The singular term “ memory” is sometimes used in this 
handbook to refer to the entire collection of storage registers.) Four special 
registers are used for storing numbers during calculations (these “stack registers”...

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Later that same day … 
Keystrokes Display  
; 
2,500.00 Turns the calculator back on. 
:1 
3,250.00 Recalls the cost of the computer to the 
display. 
6§ 
19,500.00Multiplies the quantity ordered to get 
the cost of the computers. 
:2 
2,500.00 Recalls the cost of the printer to the 
display. 
+ 
22,000.00Total invoice. 
Clearing Storage...

  Section 1: Getting Started  25 
 
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Storage register arithmetic is possible with only registers R0 through R4. 
Example:
 In the example on page 20, we updated the balance in your 
checkbook. Let’s suppose that because data is stored indefinitely in your 
calculator’s Continuous Memory, you keep track of your checking account balance 
in the calculator. You could use storage...

 
26 
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Printered Date: 2005/7/29    Dimension: 14.8 cm x 21 cm
  Section 2 
Percentage and Calendar 
Functions 
Percentage Functions 
The hp 12c includes three keys for solving percentage problems: b
, à
, and Z
. 
You don’t need to convert percentages to their decimal equivalents; this is done 
automatically when you press any of these keys. Thus, 4% need not be changed to 
0.04; you key it in the way you see and say it: 4b
. 
Pe rc e...

  Section 2: Percentage and Calendar Functions  27 
 
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Net Amount 
A net amount — that is, the base amount plus or minus the percentage amount — 
can be calculated easily with your hp 12c, since the calculator holds the base 
amount inside after you calculate a percentage amount. To calculate a net amount, 
simply calculate the percentage amount, then press =
 or -
. 
Example:...

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The à
 key can be used for calculations of the percent difference between a 
wholesale cost and a retail cost. If the base number entered is the wholesale cost, 
the percent difference is called the markup; if the base number entered is the retail 
cost, the percent difference is called the margin. Examples of markup and margin...

  Section 2: Percentage and Calendar Functions  29 
 
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To find what percentage a number is of a total, when you already know the total 
number: 
1.  Key in the total number.   
2. Press \ to separate the other number from the total number. 
3.  Key in the number whose percentage equivalent you wish to find. 
4. Press Z. 
For example, if you already knew in the preceding example...

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Day-Month-Year.
 To set the date format to day-month-year, press gÔ
. To 
key in a date with this format in effect: 
1.  Key in the one or two digits of the day. 
2.  Press the decimal point key (.). 
3.  Key in the two digits of the month. 
4.  Key in the four digits of the year. 
For example, to key in 7 April, 2004:...