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# Applying Goal Seek

With the help of Goal Seek you can calculate a value that, as part of a formula, leads to the result you specify for the formula. You thus define the formula with several fixed values and one variable value and the result of the formula.

## Goal Seek Example

To calculate annual interest (I), 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

Let us assume that the interest rate i of 7.5% and the number of years n (1) will remain constant. However, you want to know how much the investment capital C would have to be modified in order to attain a particular return I. For this example, calculate how much capital C would be required if you want an annual return of $15,000.

Enter each of the values for Capital C (an arbitrary value like $100,000), number of years n (1), and interest rate i (7.5%) in one cell each. Enter the formula to calculate the interest I in another cell. Instead of C, n, and i use the reference to the cell with the corresponding value.

1. Place the cursor in the cell containing the interest I, and choose Tools - Goal Seek. The Goal Seek dialog appears.

2. The correct cell is already entered in the field Formula Cell.

3. Place the cursor in the field Variable Cell. In the sheet, click in the cell that contains the value to be changed, in this example it is the cell with the capital value C.

4. Enter the expected result of the formula in the Target Value text box. In this example, the value is 15,000. Click OK.

5. A dialog appears informing you that the Goal Seek was successful. Click Yes to enter the result in the cell with the variable value.

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Goal Seek