factory plans to complete the production task of a batch of parts in one year. The first quarter completed the plan (1/4). The ratio of the number of parts produced in the second quarter to the first quarter was 4:5. The second quarter produced exactly 500 fewer parts than the first quarter. How many parts are planned for the whole year? indivual?
某工厂计划用一年的时间完成一批零件的生产任务．第一季度完成了计划的(1/4)，第二季度与第一季度生产的零件个数比是4：5，第二季度正好比第一季度少生产500个，全年计划生产零件多少个？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) / 5</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/20) * 4</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/4) - (1/5)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">500 / (1/20)</gadget>
<output>10_000</output>

<result>10_000</result>