GST Calculator Class

gistfile1.txt

include 'gst.php';
//adding gst
$return = gst::add(500,5);
print_r($return);
//removing gst
$return = gst::remove(500,5);
print_r($return);

gst.php

<?php

/*
GST is an Indirect Tax which has replaced many Indirect Taxes in India. The Goods and Service Tax Act was passed in the Parliament on 29th March 2017. The Act came into effect on 1st July 2017.
*/

class gst{
	/**
	 *
	 * Cal. add gst 
	 *
	 * @param    int  $cost 
	 * @param    int  $per 
	 * @return      array
	 *
	 */
	public static function add($cost,$per){
		$output = array();
		$output['GST_PRICE'] =  (($cost*$per)/100);
		$output['NET_PRICE'] = $cost + $output['GST_PRICE'];
		return $output;
	}
	/**
	 *
	 * Cal. remove gst 
	 *
	 * @param    int  $cost 
	 * @param    int  $per 
	 * @return      array
	 *
	 */
	public static function remove($cost,$per){
		$output = array();
		$output['GST_PRICE'] = $cost - ($cost * ( 100 / ( 100 + $per )));
		$output['NET_PRICE'] = $cost - $output['GST_PRICE'];  
		return $output;      
	}
}