Добавлена функция apply_discount

zadanie_1.py

@@ -77,3 +77,17 @@ def find_most_expensive_item(orders: list[dict]) -> tuple[str, float]:
         return ('', 0.0)
     most_expensive = max(orders, key=lambda x: x['price'])
     return (most_expensive['item_name'], most_expensive['price'])
+
+
+# 6. Применение скидки ко всем заказам (возвращает новый список)
+def apply_discount(orders: list[dict], discount_percent: float) -> list[dict]:
+    """
+    Уменьшает поле 'total' на discount_percent.
+    Возвращает новый список заказов, не изменяя исходный.
+    """
+    discounted_orders = []
+    for order in orders:
+        new_order = order.copy()
+        new_order['total'] = order['total'] * (1 - discount_percent / 100.0)
+        discounted_orders.append(new_order)
+    return discounted_orders