To produce a batch of parts, after the innovation, the time is reduced by 20%, but the output is increased by 60%. What is the work efficiency before the innovation?
生产一批零件，革新技术后，时间少用20%，而产量却增长60%，革新前的工作效率是革新后的多少
<gadget id="calculator">1 / 1</gadget>
<output>1</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">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">(8/5) / (4/5)</gadget>
<output>2</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>