The price of a color TV is increased by 5%, and the price is reduced by 5% shortly afterwards. How much is the price reduced after the price reduction compared with the price before the price increase?
一种彩电涨价5%，不久又降价5%，降价后的价格与涨价前相比是降价多少
<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 + (1/20)</gadget>
<output>21/20 = around 1.05</output>

<gadget id="calculator">1 - (1/20)</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">(21/20) * (19/20)</gadget>
<output>399/400 = around 0.9975</output>

<gadget id="calculator">1 - (399/400)</gadget>
<output>1/400 = around 0.0025</output>

<result>1/400 = around 0.0025</result>