100 meters long rope, cut off 20% and connect another 20%, what is the length of the rope?
100米长的绳子，剪去20%后，又接上20%，这时绳子长多少米
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(4/5) * (1/5)</gadget>
<output>4/25 = around 0.16</output>

<gadget id="calculator">(4/5) + (4/25)</gadget>
<output>24/25 = around 0.96</output>

<gadget id="calculator">100 * (24/25)</gadget>
<output>96</output>

<result>96</result>