project completed in % value

how to make a project complete estimation in %

kinda like this :

Total Project = 10
Finished Project = 3

So I got 70% done.. etc.

this one is easy because it's only 10 project, how if I had 8,12,90,120 projects.
can someone let me know

This is just simple math:

100 - ( ( finished project / total project) * 100 )

100 - (3 / 10) * 100) = 70

actually it's not working..
I got
Warning: Division by zero in /u1/hosts/thorloki/www/login/admin/projects_script.php on line 449

when

100 - ( ( finished project / total project) * 100 )

100 - (0 / 0) * 100) = Warning

Use an if statement.

$finish = //your finished project
$total = //your total project\

if($finish >= "1" && $total >= "1")
{
//do the work here
}
else
{
exit();
}

Remember, you can't divide by 0. That means "total project" must be greater than 0 or PHP will rightfully complain.