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Percent Change Function
Math Reals Class

Public Function PercentChange( _
      ByVal vX As Variant _
    , ByVal vY As Variant _
    ) As Variant

Percent increase of Y over X.

Examples: 
    PercentChange(4, 12) = 200
    PercentChange(4, 8) = 100
    PercentChange(4, 6) = 50
    PercentChange(4, 2) = -50
    PercentChange(4, 1) = -75
    PercentChange(4, 0) = -100
See also: 
    PercentChangeVerify Subroutine
    Percent Function
    PercentOfTotal Function
vX: The starting/original number. Function returns Null if vX is Null or cannot be fixed up to a number.

Function returns Null if vX is 0 (zero).

vX: The ending/final number. Function returns Null if vY is Null or cannot be fixed up to a number.

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