Help! Trying to make my code discount

[vanquishla]

A form builds a pdf which shows prices for driveway cleaning.

If its a single driveway its 15.00 off if its shared is only 7.50 off

For some reason it only shows 15.00 off also trying to get it to minus from the price under it..

if ($payment == "Before") {
{$pre="7.50";}
if (($driveway == "Single Shared") || ($driveway == "1.5 Shared") || ($driveway == "Double Shared") || ($driveway == "2.5 Shared")) {$pre="7.50";}
} else {$pre="15.00";}

Also the php file is

http://kodiaksnow.ca/contract3.php

and if you goto http://kodiaksnow.ca/cheque.html

you can try the script.

Thanks!!

[vanquishla]

Update so the code above is suppose to figure out if its shared if shared it will be 7.50 if not 15.00 for some reason it only shows 15.00

[criterion9]

Logic error

if ($payment == "Before") {
{$pre="7.50";}
if (($driveway == "Single Shared") || ($driveway == "1.5 Shared") || ($driveway == "Double Shared") || ($driveway == "2.5 Shared")) {$pre="7.50";}
} else {$pre="15.00";} 

Reads like:

if(condition){
   set "pre" to 7.5
} 
if(many conditions){
   set "pre" to 7.5
} else {
   set "pre" to 15
}

I'm surprised the code ran at all with all the extra curly brackets.