add discount to product sell js

common/components/Helper.php

@@ -0,0 +1,16 @@
+<?php
+namespace common\components;
+
+use yii\base\InvalidConfigException;
+use Yii;
+use yii\base\Model;
+
+class Helper
+{
+
+	public static function hufRound($m){
+		$result =  round($m/5, 0) * 5;
+		return $result;
+	}
+	
+}