Product Cost by Sell Price and GST

X + (X*5/100) = 500;

Find X (product cost)

<?php
    $sale_price = 500;
    $gst        = 5; //percent
    $x          = 1; //ye by default 1 hi rahega
    $y          = 100/$gst; 
    $z          = $y*$sale_price;
    $v          = $y+$x;
    echo $product_cost = $z/$v;
?>

<?php

$sale_price = 500;

$gst = 5; //percent

$x = 1; //ye by default 1 hi rahega

$y = 100/$gst;

$z = $y*$sale_price;

$v = $y+$x;

echo $product_cost = $z/$v;

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