add output of the percentage of correct answers

backend/modules/questionnaire/views/user-questionnaire/index.php

@@ -39,6 +39,13 @@ $this->params['breadcrumbs'][] = $this->title;
             ],
 //            'UUID',
             'score',
+            [
+                'attribute' => 'percent_correct_answers',
+                'value' => function($model) {
+                    $percent = $model->percent_correct_answers * 100;
+                    return $percent . '%';
+                }
+            ],
             [
                 'attribute' => 'status',
                 'format' => 'raw',