Round Total to .50 during checkout

Hi.

I need to round the Total price to .50. I will simply double the number, round it and then divide it by 2. It will give me the value I need. But I don't know where to place the code. I assume to put it to ot_total module, but I have no idea where and what. I am not very fluent in PHP and would like someone to write the line for me. I just need to modify the final total price so that instead of 1234.61 I'll get 1234.50.

Thank you in advance for any help.

Aren't your customers going to wonder what is going on with their total when it doesn't add up? ... not to mention the IRS

No because it's not an American shop, but Slovak. Here, we have to round up total prices to .50. The government (or whoever it was) cancelled smaller coins ( .10, .20) because they cost more to produce than was their real value. We still use prices as 4.90 but in the end, the total is rounded to .50. It's perfectly normal here.

Weird. Do you want people to be able to see the unrounded total until they go to checkout, or should the total displayed always be rounded.

Weird is a very relative adjective. I want it to be rounded in the last step, just before the last confirmation "click". As I said, it is completly normal in Slovak Republic to have the Total Price rounded to .50 whereever you use coins and banks. And since our customers can choose to pay in cash, they must have the possibility of paying in .50 "units", because there are no smaller coins to pay with.
I am glad that people are interested in this thread, but asking why I need it is not going to solve my problem. Please don't take any offence, I just want to put this thread to the right direction.

What tax rate do you apply to your products?

DrByte:

What tax rate do you apply to your products?
19% VAT.

breadfan:

I need to round the Total price to .50. I will simply double the number, round it and then divide it by 2. It will give me the value I need. But I don't know where to place the code. I assume to put it to ot_total module, but I have no idea where and what. ... I just need to modify the final total price so that instead of 1234.61 I'll get 1234.50.

breadfan:

I want it to be rounded in the last step, just before the last confirmation "click". As I said, it is completly normal in Slovak Republic to have the Total Price rounded to .50 whereever you use coins and banks. And since our customers can choose to pay in cash, they must have the possibility of paying in .50 "units", because there are no smaller coins to pay with.

I have no idea what other implications this will have elsewhere in the system, and whether any other calculations will be adversely affected, but this seems to work on a very simple checkout with a single taxable product without coupons or sales or discounts applied:

ot_total.php
change this:function process() { global $order, $currencies; $this->output[] = array('title' => $this->title . ':', 'text' => $currencies->format($order->info['total'], true, $order->info['currency'], $order->info['currency_value']), 'value' => $order->info['total']); }to this, by adding 2 new lines, as shown:```
function process() {
global $order, $currencies;
[B] $val = $order->info['total'];
$order->info['total'] = (round($val * 2) / 2);[/B]
$this->output[] = array('title' => $this->title . ':',
'text' => $currencies->format($order->info['total'], true, $order->info['currency'], $order->info['currency_value']),
'value' => $order->info['total']);
}

Wow, thank you very much DrByte. I am going to try it tomorrow and will let you know about the results. But I'll back up the files and database before doing any modifications.
One more question: Do you think that the modified result will be also written to the database? I need it that way because the invoices are printed from admin interface.
Thank you once again :)