A factory processes a batch of parts. In the first week, 500 more than 20% of the total are completed, and the remaining 20% more than 500 are completed in the second week. In this way, there are 2,300 unprocessed parts. How many parts are there in this batch?
某工厂加工一批零件，第一周完成了总数的20%多500个，第二周又完成了剩余的20%多500个，这样还剩2300个没有加工，这批零件一共有多少个？
<gadget id="calculator">2_300 + 500</gadget>
<output>2_800</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">2_800 / (4/5)</gadget>
<output>3_500</output>

<gadget id="calculator">3_500 + 500</gadget>
<output>4_000</output>

<gadget id="calculator">4_000 / (4/5)</gadget>
<output>5_000</output>

<result>5_000</result>