The master and the apprentice make a batch of parts together, the master makes 80 parts per hour, and the apprentice makes 60 parts per hour. After 12 hours to complete. How many parts are there in total?
师徒两人合做一批零件，师傅每小时做80个，徒弟每小时做60个．经过12小时完成．这批零件一共有多少个？
<gadget id="calculator">80 + 60</gadget>
<output>140</output>

<gadget id="calculator">140 * 12</gadget>
<output>1_680</output>

<result>1_680</result>