A bicycle factory changed production. Last year, it planned to produce 40,000 electric bicycles. In the first half of the year, it actually completed (2/5) of the plan, and in the second half of the year, it completed 75% of the plan. How many more cars were actually produced than planned?
某自行车厂实行转产，去年计划生产电瓶车40000辆，实际上半年完成计划的(2/5)，下半年完成计划的75%，实际比计划多生产多少辆？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(3/4) - 1</gadget>
<output>-1/4 = around -0.25</output>

<gadget id="calculator">(2/5) + (-1/4)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">40_000 * (3/20)</gadget>
<output>6_000</output>

<result>6_000</result>