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 FileMaker Pro Custom Functions

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IRR ( IRR1; IRR2 ; NPV1 ; NPV2 )

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Barry Maskell, CB Richard Ellis
www.cbre.com.au

IRR - Calculate the IRR through 'Interpolation'

Sample Input:
IRR ( 11 ; 12 ; 35167 ; 54790 )
Sample Output:
11.39


 Then copy & paste into FileMaker Advanced's Edit Custom Function window.

Click here to copy To Clip Manager if you have myFMbutler's Clip Manager installed

Description:

Where the IRR is required without the use of a spreadsheet or as a check method, the IRR for a project can be calculated through INTERPOLATION, through simple linear interpolation. This involves finding the IRR of two trials where the NPV is either side of zero. Then by using the interpolation formula, the IRR can be found.

Eg: IRR1 = 11%
IRR2 = 12%
NPV1 = $35,167
NPV2 = $54,790
RESULT IRR : 11.36%
*/

Note: these functions are not guaranteed or supported by BrianDunning.com. Please contact the individual developer with any questions or problems.

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