Update app.py

app.py

@@ -206,7 +206,7 @@ def calculate_score_and_grade(llm_response):
     total_score = int(total_score)
     max_possible_score = int(max_possible_score)
 
-    percentage = (total_score / max_possible_score) * 100 if max_possible_score > 0 else 0
+    percentage = (max_possible_score/total_score) * 100 if max_possible_score > 0 else 0
 
     if percentage > 90:
         grade = 'O-grade'