wip fix

app/Utilities/Margin.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace App\Utilities;
+
+class Margin
+{
+    public static function calculate($arr, $stellen = 3)
+    {
+        if (! is_array($arr)) {
+            return false;
+        }
+        $r = 0;
+        foreach ($arr as $value) {
+            $value = $value < 1 ? 1 : $value;
+            $r += 100 / $value;
+        }
+
+        return round($r, $stellen);
+    }
+}