For a brand of color TV in a color TV specialty store, the pre-New Year’s promotion price was 15% lower than the original price, and now it has increased by 15%. Compared with the price before the New Year’s Day, is the current price of this brand of color TV increased or not? Dropped? What is the rate of change?
某彩电专卖店的一种品牌彩电，元旦节前促销价比原定价降低了15%，现在又提高了15%，这款品牌彩电现在的价格与元旦节前的价格相比，是涨了还是降了？涨跌幅度是多少？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 - (3/20)</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">1 + (3/20)</gadget>
<output>23/20 = around 1.15</output>

<gadget id="calculator">(17/20) * (23/20)</gadget>
<output>391/400 = around 0.9775</output>

<gadget id="calculator">1 - (391/400)</gadget>
<output>9/400 = around 0.0225</output>

<result>9/400 = around 0.0225</result>