A workshop processes a batch of parts, what is completed on the first day is (8/9) of the second day, and what is completed on the second day is the total (3/7). It is known that 100 more parts are made on the second day than on the first day. How many parts are there in this batch?
某车间加工一批零件，第一天完成的是第二天的(8/9)，第二天完成的是总数的(3/7)．已知第二天比第一天多做100个零件．这批零件共有多少个？
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">(3/7) * (8/9)</gadget>
<output>8/21 = around 0.380952</output>

<gadget id="calculator">(3/7) - (8/21)</gadget>
<output>1/21 = around 0.047619</output>

<gadget id="calculator">100 / (1/21)</gadget>
<output>2_100</output>

<result>2_100</result>