A commodity is sold with a 15% reduction in the original price in the off-season, and the off-season price is increased by 10% in the peak season a month later. Has the price ratio increased or decreased, and by how much?
一种商品，由于淡季将原价降低了15%出售，一个月后进入旺季将淡季的价格上涨10%，价比是涨了还是跌了，跌涨幅度是多少？
<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">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 + (1/10)</gadget>
<output>11/10 = around 1.1</output>

<gadget id="calculator">(17/20) * (11/10)</gadget>
<output>187/200 = around 0.935</output>

<gadget id="calculator">1 - (187/200)</gadget>
<output>13/200 = around 0.065</output>

<result>13/200 = around 0.065</result>