[RESOLVED] Calculations

[talkster5]

Hi I am currently trying to make a calculation of a 5% discount on a price when it is over a 3 month period. I am pretty sure my calculations are wrong as it does not discount the $price3 properly because of the decimal place. Can anyone suggest a better equation to calculate the 5% discount after the original price has been timsed by three please.

$percent3 = "5";
$price3 = $price*3;
$percentage3 = $price3/100*$percent3;
$dif3 = $price-$percentage3;
$final3 = round($dif3, 2);

[kburger]

Just multiply by .95 and round the result.

[talkster5]

Which part of it do I need to multiplay by .95?

[kburger]

Whatever you want to take a 5% discount on.

$discountedtotal = round(($total * 0.95), 2);

That's the general concept. I'll let you figure out how to apply that logic.

[toplay]

if you need to show the discount amount then you do need to do more than that anyway. Example:

$qty = 3;
$price = 100.25;

$disc_percent = 5 / 100; // or assign as .05
$extended_price = $price * $qty; // Price multiplied by quantity
$discount = round($extended_price * $disc_percent, 2); // Round discount
$disc_price = $extended_price - $discount; // Discounted price before tax + shipping


echo '$qty = ', $qty, '<br>';
echo '$price = ', $price, '<br>';
echo '$disc_percent = ', $disc_percent, '<br><br>';
echo '$extended_price = ', $extended_price, '<br>';
echo '$discount = ', $discount, '<br>';
echo '$disc_price = ', $disc_price, '<br>';

The above would output something like:

$qty = 3
$price = 100.25
$disc_percent = 0.05

$extended_price = 300.75
$discount = 15.04
$disc_price = 285.71

[talkster5]

thanks Kburger I will try that out. If I am doing 10% and 20% would I just do .90 and .80?

[kburger]

No problem. Yes, that's correct. (Wow, I thought American schools were bad.) 😉

[talkster5]

Thanks for your help.