Percentage for a Percentile

[amars]

Hi all,

I wish to find out the Percentage value of a score within a list of scores while calculating Percentile

.

In a normal scenerio, we have list of scores and a percentageValue

Percentile Value ??? = Fractile(Score,PercentageValue)

now in my case I know the Percentile Value & the score and need to find out the PercentageValue

Percentile Value = Fractile(Score, PercentageValue????)

Is there any function which does that?

Thanks in advance....

Amar