help with the formula to compute rate

[ehpratah]

hi need a hand here..

im having trouble in making my code work(well actually im not getting it)what i need to do is to compute the rate of vehicle that is rented..the only thing ta ht i came up is with the perday rate and the other 2 i cant find a way(i really sucks with formula )here is the thing..

SELF - DRIVE RATES

1. Minimum rental periods :
Daily - 24 hours
Weekly - 7 days
Monthly - 30 days


CAR
Toyota VIOS 1.3 MT
DAILY
2,500

WEEKLY
15,000

MONTHLY
52,500


and this is the code that i can came up

<?php
  $vehicle;
$rday=$_POST['txtrday'];
$pday=$_POST['txtpday'];
    $phr;
    $total;
    $totalhr;
    $pday;
    $totald;
    $totalday;
    $rmonth;
    $pmonth;
    $totalm;
    $totalmonth;
 
if($vehicle=="Toyota VIOS 1.3 MT")
{
    $perday=2500;
    $permonth=52500;
    $perweek=15000;
 
    if($rday>$pday)
        {
        $totald=($rday)-($pday);
 
        }
    else if($rday==$pday)
        {
        $totalday=$perday;
        }
 
 
    if($rmonth>$pmonth)
        {
        $totalm=$rmonth-$pmonth;
 
 
        }
    else if($rmonth==$pmonth)
        {
        $totalmonth;
        }
 
        $totalday=$perday * $totald+2500;
        $totalmonth=$totalm * $permonth;
        $rate=$totalday + $totalmonth;     
}
?>
 

please see attached image to see the output..in need of lot of help right now

[ehpratah]

and if you need to see the actual web here is the link http://europcar1.com.ph/selfdrive.php

just choose NO in the part that will ask you if you have a corporate accnt..thanks