HP 20b Business Consultant Financial Calculator User Manual Page 33
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Mathematical Calculations
25
Recalling a Menu Item Value in a Menu
In a menu, you can recall the current value of a menu item. For example, open the Interest
Conversion menu (IConv) by pressing :&. With Nom.% displayed, pressing
2*L== calculates 2 times the nominal rate. This feature is useful when
you need to insert the contents of a menu item into an algebraic operation.
Recalling and Storing Values in the Data and Cash Flow Menus
If you store an index (i) from 0 to 99 in the variable 0, you can then use the store/recall
features to store a number in the Data and Cash Flow menus. Press either :$ or L,
followed by the CashFlow key C, to either store or recall a number, as desired, in the
CF(i/2) (if i is even) or #CF((i-1)/2) if i is odd.
In addition, you can store or recall x(i/2+1) if i is even, or y((i+1)/2) if i is odd, as desired,
by pressing the Data key
:y instead of the CashFlow key, C, as shown above.
Rounding Numbers
All calculations are performed internally with 15-digit precision and are rounded to 12 digits
when returning the results. In certain instances, calculations are performed internally with
greater than 15-digit precision.
When displayed, a number is further rounded to the number of digits after the decimal point
set by the FIX item in the Mode menu. The default setting is two digits to the right of the
decimal point. For more information, refer to the section titled, The Mode Menu: Setting
Preferences in Chapter 1.
NOTE: the FIX setting only affects the display; it does not affect the actual numbers.
Percentages
In Algebraic or Chain modes, pressing % divides a number by 100. For example, pressing
25% returns 0.25.
To find a percentage of a given number, key in the number and multiply it by the desired
percentage, followed by =. For example, to find 25% of 200, press
200*25%= to return a result of 50.
To add or subtract a percentage of a number, key in the first number, followed by + or
- and the percentage followed by %. Finish your calculation with =. For example,
to add 10% to 50, press
50+10%= to return a result of 55.
- HP 20b Business Consultant 1
- HP 30b Business Professional 1
- Legal Notice 2
- Keyboard Map Legend 5
- Table of Contents 7
- Selecting a Language 9
- Two Line Display 10
- until the 11
- <<< 12
- << 12
- Basic Features 13
- Annunciators 14
- The Input Key 14
- The Equals Key 14
- Editing and Clearing Entries 15
- The On/CE Key 15
- The Reset Menu 15
- Notes about Special Menus 16
- Memory and the Memory Menu 16
- Accessing Menus and Menu Maps 16
- or > 17
- returns 17
- with that 17
- Basic Features10 18
- Mathematical Functions 19
- Number Entry and Display 19
- Chain Mode 20
- Algebraic Mode 20
- I or = are valid 21
- I, this 22
- + changes the 22
- <<<< 23
- Mathematical Calculations 25
- Mathematical Calculations18 26
- Random number 27
- The Math Menu 27
- I on any of these items to 28
- The Probability Sub-menu 29
- Binomial Functions 31
- Two-Number Functions 31
- Storing and Recalling Numbers 32
- Recall Arithmetic 32
- returns 0.25 33
- % to add or subtract x % 34
- - returns 150, or 200-25% 34
- 3 Time Value of Money 35
- :x. Press < or > 37
- A. The Amortization 37
- V, M and [ 37
- A followed by < or 38
- I to reset, or O to cancel 40
- :& 41
- O once again 42
- Canadian Mortgage Example 44
- as 1 is the default 45
- Cash Flow Example 46
- P and IRR R 49
- Cash Flows42 50
- Editing Cash Flows 52
- Sample Cash Flow Diagrams 54
- = to calculate it 56
- Bond Calculation Example 57
- O again to exit the menu 58
- :(HOLD)B 59
- The Black-Scholes Menu 60
- (the Black-Sholes key) 60
- = in the 61
- to scroll through the menu 62
- :(HOLD) B 63
- to scroll to the 64
- 8 Date Calculation 65
- 9Break-even 67
- The Percent Calculation Menu 69
- repeatedly to scroll to the 69
- Percent Calculation Examples 70
- to reset the menu, or O to 72
- 11 D e p r e c i a t i o n 73
- The Depreciation Menu 74
- Depreciation Example 75
- 12 Statistical Operations 77
- The Data and Stats Menus 78
- Statistics Example 80
- :z<< 82
- 13 Programming 83
- : and simultaneously 83
- : >or< 84
- Programming Example 85
- Program Step 0 86
- : and the < 87
- Programming80 88
- Figure 2 88
- (HOLD) 89
- Sub-Function Call 90
- and (HOLD) functions 90
- .05003:$1 91
- Messages 92
- (HOLD) . If you want to 93
- Programming86 94
- Table 13-4 94
- Digit Description 94
- Programming88 96
- 14 E rro r M e s s a g e s 97
- Replacing the Batteries 99
- Regulatory Information 100
- Modifications 101
- Canadian Notice 101
- Avis Canadien 101
- Japanese Notice 102
- Korean Notice 102
- Contact Information 103
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