HP 30b HP 30b Business Professional Quick Start Guide - Page 15

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

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Figure 4 At this point, to return to the display of the Fixed menu item shown in Figure 3, press O. 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 Getting Started 9

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Getting Started
9
Figure 4
At this point, to return to the display of the
Fixed
menu item shown in
Figure 3, press
O
.
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