A piece of paper, (1/4) of this paper is used for the first time, and (1/2) of the first time is used for the second time, how much of this paper is used for the second time
一张纸，第一次用了这张纸的(1/4)，第二次用的相当于第一次的(1/2)，第二次用了这张纸的多少
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">(1/4) * (1/2)</gadget>
<output>1/8 = around 0.125</output>

<result>1/8 = around 0.125</result>