If the price of a product is reduced by 20% and then raised by 20%, what is the current price of the original price?
一件商品，先降价20%，后又提价20%，现在售价是原价的多少
<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">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">1 * (4/5) * (6/5)</gadget>
<output>24/25 = around 0.96</output>

<result>24/25 = around 0.96</result>