OpenOffice.org 2.x Guía de usuario Pagina 289

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Chapter 4: Spreadsheets in Calc
Applying Goal Seek
With the help of Goal Seek one can calculate a value that, as part of a formula, leads to the
result specified for the formula. Thus the formula is defined with several fixed values and one
variable value and the result of the formula.
Goal Seek is best illustrated by means of an example.
To calculate annual interest, create a table with the values for the capital (C), number of
years (n), and interest rate (i). The formula is: I = C * n* i / 100
Note: Formula can also be entered using the variable names:
Interest = Capital * Year *
Interest rate / 100.
In this example, the investment capital of $150,000 and an interest rate of 7. 5% is
calculated to result in annual interest income of $11,250. (The cells are formatted after
calculation: A5 and E5 as currency, and C5 as percent. The cell width is adjusted
automatically.)
For ease of use, assign names to cells so that they can be used in the formula.
Naming Cells
Using the example graphic above:
1. Select cell A5 in the example
2. Select Insert > Names > Define. The Define Names dialogue appears.
3. Enter the name C in the text field. At the bottom of the dialogue, the reference:
$Sheet 1.$A$5 is displayed.
4. Double-check for accuracy.
5. Click Add.
6. In the next field, enter an i, set the cursor in cell B5.
7. Click Add.
8. Next, enter ann in the empty field, set the cursor in cell C5,
9. Click Add.
10.Close the dialogue with OK.
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