How to take off a percentage?

Hi,

I have the following values:

49.99
99.99
149.99
199.99

People can enter a coupon code to take away e.g. 10, 20, 30%

How would i take away one of the above percentages away from e.g. 199.99

Cheers,
Adam

 

More of a math question? Just subtract the % from 1 and multiply. If its 10%, 99.99 * .9 , 20%, 99.99 * .8 etc. Which is nothing more than reversing the process. Instead of saying its 10% off, you are just charging them 90% of the price.

 

So something like this then?

$total = 199.99;
$maintotal = $total*(50/100);

The only problem with this is i get back 75 but what i need back is 74.99

Any ideas?

 

Is that the case for all values?

You could do:

$total = 199.99;
$maintotal = $total * 0.5; // Change 0.5 to a different value based on percentage.
$maintotal2 = round($maintotal, 2); // Rounds to the nearest cent (in case after math you have three decimal points)
$maintotal3 = $maintotal2 - 0.01; // Lose 1 cent to round back down to 99 cents instead of a whole number.

// echo($maintotal3); will return $99.99 in this case

 

Force the numbers to floats and format the output.

<?php
(float) $price = 99.99;
(float) $salePrice = $price * .5;
echo $salePrice;
echo "<br>";
$formatted = sprintf("%01.2f", $salePrice);
echo $formatted;
?>

Code (markup):

output is :
49.995
49.99