A 0.8-meter-long rope is cut off by 40% for the first time, and (1/4) for the second time. How much less is the second time than the first time?
一根长0.8米的绳子，第一次剪去40%，第二次又剪去(1/4)，第二次比第一次少剪了多少米？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 4</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">0.8 * (3/20)</gadget>
<output>0.12</output>

<result>0.12</result>