A certain rice shop originally had 800 kilograms of rice, and has sold 11 bags of 50 kilograms each. How many kilograms of these rice are left?
某米店原有大米800千克，已卖出11袋，每袋50千克，这些大米还剩多少千克？
<gadget id="calculator">50 * 11</gadget>
<output>550</output>

<gadget id="calculator">800 - 550</gadget>
<output>250</output>

<result>250</result>