def calculate_final_price(total_amount): if total_amount >= 4000: discount_rate = 0.6 elif total_amount >= 3000: discount_rate = 0.7 elif total_amount >= 2000: discount_rate = 0.8 else: discount_rate = 1.0 final_price = total_amount * discount_rate return round(final_price, 1) total_amount = int(input("请输入购物金额：")) final_price = calculate_final_price(total_amount) print(f"实际支付金额：{final_price}")