Problem with a math code

[legor]

I have a math code that is giving to me the wrong answer, I check   already the order of my code but I cannot see the problem, there is my   code
 
  $loan = $_POST['t_loan'];
  $rate = $_POST['rate'];
  $monts = $_POST['months'];
  $f_rate = $rate/100;
 
 
  $payment = ($loan * ($f_rate / 12)) * (pow((1 + ($f_rate / 12)), $monts) / ((pow((1 + ($f_rate / 12)), $monts)) + 1));
 
  $payment = round($payment);
  Print "$payment";
 
  there is the equation
 
 
 
  With a Loan of 18000 rate of 4.9(0.049) and 60 months to pay the result should be a 338 monthly payment but I am getting 41
 
  I really appreciate any help
 
 
 

[phphelp]

At the end of your line you have + 1, while on picture it says - 1

[legor]

Yea I figure out early and changed but any way still cannot have the correct result, I changed the code again this one is the new one:

$loan = $_POST['t_loan'];
$rate = $_POST['rate'];
$monts = $_POST['months'];
$f_rate = $rate/100;


$payment = $loan * ($f_rate / 12) * (pow((1 + ($f_rate / 12)), $monts) / pow((1 + ($f_rate / 12)), $monts) - 1);

$payment = round($payment);
Print "$payment";

[Smokey PHP]

Hi there,

Try this line:

PHP Code: [Select]


$payment = $loan * ($f_rate / 12) * (pow((1 + ($f_rate / 12)), $monts) / (pow((1 + ($f_rate / 12)), $monts) - 1));


in place of:

PHP Code: [Select]


$payment = $loan * ($f_rate / 12) * (pow((1 + ($f_rate / 12)), $monts) / pow((1 + ($f_rate / 12)), $monts) - 1);


Let me know how it goes.

[legor]

Thank you very much, now is working.

A++++