Preisrechner: Rappenrundung im Backend und Rabatt-Rechner im Web

agentd task d23b198e9bef4e0c99f52c532c317f70

src/Prices/PriceCalculator.cs

@@ -16,6 +16,7 @@ public static class PriceCalculator
             throw new ArgumentOutOfRangeException(nameof(discountPercent), "A discount is between 0 and 100 percent.");
         }
 
-        return price - discountPercent;
+        var raw = price * (100 - discountPercent) / 100;
+        return Math.Round(raw / 0.05m, MidpointRounding.AwayFromZero) * 0.05m;
     }
-}
+}