diff --git a/lekerdezesek/lekerdezesek.sql b/lekerdezesek/lekerdezesek.sql
index 9badba0..2e82f3d 100644
--- a/lekerdezesek/lekerdezesek.sql
+++ b/lekerdezesek/lekerdezesek.sql
@@ -39,5 +39,5 @@ SELECT sum(rendelesek.mennyiseg) AS `mennyiseg` FROM rendelesek
 
 SELECT
     round(sum(rendelesek.termekAr)) AS `brutto`,
-    round(sum(rendelesek.termekAr * (1 - (1 / (1 / rendelesek.afakulcs))))) AS `afa`
-    FROM rendelesek;
\ No newline at end of file
+    round(sum(rendelesek.termekAr * (1 - (1 / (1 + rendelesek.afakulcs))))) AS `afa`
+    FROM rendelesek;