PHP number calculation

[l!m!t]

 

I have a form which posts a dollar amount I am trying to figure out how I can add $10 for every $1000 ?

 

so it should do the  following

$1000 + 10

$2000 + 20

$3000 + 30

 

How would I go about doing this? The only thing I can think of would be a for loop and to some how break up the values into thousands.. - I am new to PHP so don't fully know all the functions.

 

Any suggestion would be great.

[Mchl]

$value * 1.01;

 

or, if for every full thousand:

 

$value = $value + 10 * floor($value/1000);

[l!m!t]

 

Hi,

 

Thanks for the help!  Is there anyway I can narrow down to only the fist number?

 

The example below kicks out 505O, but I only need one 50

 

$value=5000;
echo $value * 1.01;
//result 5050

[ignace]

I was never good at math but this is crazy

 

but I only need one 50

 

$amount * 0.01

[l!m!t]

 

God.. I must be tired.  I was set on a single digit like "10"... I didn't see the result was the actual total.

 

Thanks again for your time.