Either way - to figure out percentages, you divide the small number by the big number, and multiple by 100.
Looking at your code, I think you're doing it the other way round. (Presuming that $numbermembers is the total number, and $newuserid is the fraction of that.) If $newuserid is the bigger number, ignore the variable switch I made in the vb_number_format function below.
I've also removed the if statement, as I can't see what the difference is between the code in each branch.
PHP Code:
// this gives us a value in the $statscache['activepercent'] variable
$statscache['activepercent'] = vb_number_format(($newuserid / $numbermembers) * 100, 2 );
// You can lob off the last two digits:
$lasttwo = substr($statscache['activepercent'], -2);
// And then see if that equals 00
if ($lasttwo == '00')
{
// intval returns an integer value
$statscache['activepercent']= intval($statscache['activepercent']);
}
// if you want it in the variable, we can add the trailing % from before
$statscache['activepercent'] .= '%';
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