Wang Ming is 150 cm tall, and the door of the classroom is 2 meters high. How many centimeters is Wang Ming shorter than the door?
王明身高150厘米，教室的门高2米，王明比门矮多少厘米？
<gadget id="calculator">2 * 100</gadget>
<output>200</output>

<gadget id="calculator">200 - 150</gadget>
<output>50</output>

<result>50</result>