A commodity used to be 120 yuan per piece, but the price was increased by 20% and then reduced by 20%, how much is it now?
一种商品原来每件120元，提价20%后又降价20%，现在每件多少元？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

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

<gadget id="calculator">120 * (6/5) * (4/5)</gadget>
<output>576/5 = around 115.2</output>

<result>576/5 = around 115.2</result>