Master Wang produces 47 parts per hour, 21 hours, just half of the production, how many more parts can be produced to complete the task?
王师傅每小时生产47个零件，21小时，刚好生产了一半，再生产多少个可以完成任务？
<gadget id="calculator">47 * 21</gadget>
<output>987</output>

<result>987</result>