Re: Mathematical prob
| From: | Joe Conway | Date: | Tue, 13 Feb 2001 05:56:18 +0000 |
| Subject: | Re: Mathematical prob | ||
| References: | 1 | Groups: | php.general |
| Request: | Send a blank email to php-general+get-39358@lists.php.net to get a copy of this message | ||
> Okay, im a little stumped. I have been asked to use a formula which
> calculates Monthly Repayments on a mortgage loan. The formula I have been
> given is
>
> M = P * ( J / (1 - (1 + J) ** -N))
>
> My problem is, the last part. It explains it in english as "then take that
> to the -N (minus N) power"
>
> My problem is, I have no idea how to put this into a PHP script so that it
> can calculate it out. I have a feeling im falling short at the "to the
> power of" part. I tried to do a 3 to the power of 3 calculation and I cant
> get it to spit out 27 like I know it should.
>
Chris,
I think this is what you're looking for:
<?PHP
echo "<html><body>";
// principle
$P = 180000;
// annual rate divided by 12 months
$J = 0.0775/12;
// 30 years times 12 months
$N = 360;
// monthly payment
$M = $P*($J/(1-pow((1+$J),-$N)));
echo $M;
echo "</body></html>";
?>
Hope this helps,
Joe