The original price of a shirt is 100 yuan. After the price has increased (1/5), the price has been reduced (1/5). Has the shirt improved or decreased compared to the original? How much was it raised or lowered?
一件衬衫原来的价格是100元，涨价(1/5)后，又降价(1/5)．这件衬衫和原来相比是提高了还是降低了？提高或降低了多少元？
<gadget id="calculator">1 / 5</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">100 * (6/5) * (4/5)</gadget>
<output>96</output>

<gadget id="calculator">100 - 96</gadget>
<output>4</output>

<result>4</result>