A motor factory planned to produce a batch of motors, and started to produce 50 units per day. After the planned (1/5) production was completed, the work efficiency was increased by 60% due to technological transformation, so the task was completed 3 days earlier than planned. The production of this batch of motors How many units is the task?
某电机厂计划生产一批电机，开始每天生产50台，生产了计划的(1/5)后，由于技术改造使工作效率提高60%，这样完成任务比计划提前了3天，生产这批电机的任务是多少台？
<gadget id="calculator">1 / 5</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">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 + (3/5)</gadget>
<output>8/5 = around 1.6</output>

<gadget id="calculator">(4/5) / (8/5)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(4/5) - (1/2)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">3 / (3/10)</gadget>
<output>10</output>

<gadget id="calculator">10 * 50</gadget>
<output>500</output>

<result>500</result>