HP 30b HP 20b Business Consultant and HP 30b Business Professional User's Guid - Page 18

Read/write, Fixed, INPUT, Read-only, Write-only, Inv. I, Special items, Degree/Radian, Price, Profit - irr

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:P Fixed Cost Price DWN Profit Quantity Figure 7 Menu Map of the Break-even menu There are four types of menu items: 1. Read/write. Read/write menu items, such as Fixed in the Break-even menu shown above, are easily recognizable, because when they are selected, both the INPUT and small (=) annunciators are lit. When lit, these annunciators indicate that keying in a I number and pressing will store the entered number in the displayed menu = item. Pressing (outside of a mathematical operation) calculates the value for that item based on available data. 2. Read-only. Read-only items such as Internal Rate of Return (IRR% ) in the IRR menu are display-only; they are values computed internally by the calculator. 3. Write-only. Write-only items, such as investment interest rate (Inv. I% ) in the Net Present Value (NPV) menu, are similar to read/write items in that the INPUT annunciator is lit when these items are selected, indicating that keying in a number and pressing I = stores that number in that menu item. However, the key does not calculate a value for that item. 4. Special items. Special items, such as the Degree/Radian option in the Mode menu, the items of the Reset menu, and the items of the Percent Calculation (%calc ) menu perform I an action when is pressed. Depending on the menu, this action can be the selection of a sub-menu (%calc), changing a mode or setting (Mode menu), or erasing data (Reset menu) 10 Basic Features

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Basic Features
10
Figure 7
Menu Map of the Break-even menu
There are four types of menu items:
1.
Read/write
. Read/write menu items, such as
Fixed
in the Break-even menu shown
above, are easily recognizable, because when they are selected, both the
INPUT
and
small (
=
) annunciators are lit. When lit, these annunciators indicate that keying in a
number and pressing
I
will store the entered number in the displayed menu
item. Pressing
=
(outside of a mathematical operation) calculates the value for that
item based on available data.
2.
Read-only
. Read-only items such as Internal Rate of Return (
IRR%
) in the IRR menu are
display-only; they are values computed internally by the calculator.
3.
Write-only
. Write-only items, such as investment interest rate (
Inv. I%
) in the Net Present
Value (NPV) menu, are similar to read/write items in that the
INPUT
annunciator is lit
when these items are selected, indicating that keying in a number and pressing
I
stores that number in that menu item. However, the
=
key does not
calculate a value for that item.
4.
Special items
. Special items, such as the
Degree/Radian
option in the Mode menu, the
items of the Reset menu, and the items of the Percent Calculation (
%calc
) menu perform
an action when
I
is pressed. Depending on the menu, this action can be the
selection of a sub-menu (%calc), changing a mode or setting (Mode menu), or erasing
data (Reset menu)
:P
Fixed
DWN
Cost
Price
Profit
Quantity