When an air conditioner enters the peak sales season, the price is increased by 20%; after entering the off-season, the price is reduced by 20%. Has the price increased or decreased now compared to before the price increase? What is the percentage change?
一款空调进入销售旺季时，提价20%；进入淡季后，又降价了20%．现在价格与提价前相比，是涨了还是降了？变化幅度是百分之几？
<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">(4/5) * (6/5)</gadget>
<output>24/25 = around 0.96</output>

<gadget id="calculator">1 - (24/25)</gadget>
<output>1/25 = around 0.04</output>

<result>1/25 = around 0.04</result>