After Master Zhang improved the production process, the time it took to make a part was shortened by 50% compared with the past, how much his work efficiency has improved.
张师傅改进生产工艺后，制作一个零件所用的时间比过去缩短了50%，他的工作效率提高了多少．
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

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

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

<gadget id="calculator">1 / (1/2)</gadget>
<output>2</output>

<gadget id="calculator">2 - 1</gadget>
<output>1</output>

<gadget id="calculator">1 / 1</gadget>
<output>1</output>

<result>1</result>