Master Zhang goes to work at 8:00 am and eats at 12:00 noon. If he processes 9 parts per hour on average, how many parts can he process in half a day?
张师傅上午8：00上班，中午12：00吃饭，如果他平均每小时加工9个零件，那么半天能加工多少个零件？
<gadget id="calculator">4 * 9</gadget>
<output>36</output>

<result>36</result>