The price of a certain product is reduced by 20% due to the backlog, and then the quality is improved, and the price is increased by 20%, and the price is increased by 20% due to the best-selling, and finally the price is reduced by 20% when the warehouse is cleared. The price at the time of clearance is the original price.
某种商品因积压而降价20%，随即提高质量，又提价20%，后因畅销又提价20%，最后清仓时又削价20%．清仓时的价格是原价的多少．
<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">(4/5) * (6/5) * (6/5) * (4/5)</gadget>
<output>576/625 = around 0.9216</output>

<result>576/625 = around 0.9216</result>