A used to make 4 parts per hour, but now it makes 5 parts per hour. How much is the work efficiency increased?
甲原来每小时做4个零件，现在每小时做5个，工作效率提高了百分之几？
<gadget id="calculator">5 - 4</gadget>
<output>1</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>