Now the cost is lower than before (1/4), what is the original cost now.
现在成本比原来降低(1/4)，现在成本是原来的多少．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>