calculating percentages

[Synergic]

i don't know why the following isn't working. I'm trying to calculate 10% of a value?

[code]
$a = 10/100;
$b = 0;
$b = $a*$b;
echo $b;
[/code]

it just gives me 0 :|

[extrovertive]

Remember in pre-school A*0 = 0? Anything times zero becomes 0 right?

$val = (val);

$newval = $val - (.10*$val);

[Synergic]

heh whoops yes it works now:

[code]

$a = 10/100;
$b = 1000;
$b = $a*$b;
echo $b;
[/code]