I need to add (2) sums and divide it by a count

then subtract the result from 1

and display the final result as a percentage

 

1-  (

(Sum of {@rDE} + Sum of {@rDL}) 

  / 

Count of {vwVDR.D_R_D}    )

 

 

result = 1 - ((3 + 5) /20)  = 60%

 

in a group footer where fields containing all this reside

 

TIA