For a piece of clothing, first reduce the price (1/8), then raise the price (1/8), ask how much cheaper it is.
一件衣服，先降价(1/8)，再提价(1/8)，问便宜了多少元．
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 - (1/8)</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">1 + (1/8)</gadget>
<output>9/8 = around 1.125</output>

<gadget id="calculator">1 * (7/8) * (9/8)</gadget>
<output>63/64 = around 0.984375</output>

<gadget id="calculator">1 - (63/64)</gadget>
<output>1/64 = around 0.015625</output>

<result>1/64 = around 0.015625</result>