The County Machinery Factory processed a batch of parts, completed (3/5) of the plan for the first half of the year in the first quarter, and completed 62.5% of the plan for the first half of the year in the second quarter, resulting in an overproduction of 450 pieces. If the ratio of completed parts in the first half of the year to the second half of the year is 4:5, how many parts will be completed in the whole year?
县机械厂加工一批零件，第一季度完成上半年计划的(3/5)，第二季度完成上半年计划的62.5%，结果超产450个．若上半年与下半年完成个数之比4：5，全年将完成多少个零件？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">62.5 / 100</gadget>
<output>0.625</output>

<gadget id="calculator">0.625 - 1</gadget>
<output>-0.375</output>

<gadget id="calculator">(3/5) + (-0.375)</gadget>
<output>0.225</output>

<gadget id="calculator">5 + 4</gadget>
<output>9</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">450 / 0.225 / (4/9)</gadget>
<output>4_500</output>

<result>4_500</result>