Williams Percent R Question

 
How does MT4 Calculate Williams Percent R?

I have tried to dupicate it by using this formula

HC = Highest High [in %R Periods] - Close [today]
HL = Highest High [in %R Periods] - Lowest Low [in %R Periods]
%R = HC / HL * -100

But If MT4 is using a different formula then I would like to know what you are using

EDIT NOTE**** Nevermind I figured it out :)
Thanks
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Thank You
EK
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