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subtracting a value from a row in mysql using radio button


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I have tried using an if statement condition:

<?php if($_SESSION['power']=='No' && $_SESSION['display']=='No' && $_SESSION['liquid']=='Yes' && $_SESSION['buttons']=='Yes' && $_SESSION['enclosure']=='Yes') {?>
             <div class="pricefont"><b>$<?php echo $result["price3d"]; ?></b></div> Quoted Price<br><br>
             <?php } ?>

And i have these values stored in price, price2d, price3d, price4d, price5d amd whatever the condition met it outputs the value in row. It will show the value but i don't know how to insert this value to database as its only a result.

If it can be then  it will solve my problem. Please find screenshot


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if($_SESSION['power']=='No' && $_SESSION['display']=='No' && $_SESSION['liquid']=='Yes' && $_SESSION['buttons']=='Yes' && $_SESSION['enclosure']=='Yes')
$quotedprice = $result["price3d"];


Edited by dardime
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So how does the calculation work exactly? You start with a base price, and each defect reduces it by 5.00? Then simply count the “No” selections.

price = base_price − defect_count × 5.00  

Note that with some of your example data, the result will be 0.00 if all selections are “No”.

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