A merchant sells a product at an 80% discount on the original price, and a week later coincides with the anniversary, and the merchant sells the product at a 40% discount. At this time, the price of the product has increased by how much?
某商家将某件商品在原价的基础上提高80%出售，一周后恰逢周年庆，商家又6折出售该商品，此时该商品的价格比原价提高了百分之几？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 + (4/5)</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">1 * (9/5)</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(9/5) * (3/5)</gadget>
<output>27/25 = around 1.08</output>

<gadget id="calculator">(27/25) - 1</gadget>
<output>2/25 = around 0.08</output>

<gadget id="calculator">(2/25) / 1</gadget>
<output>2/25 = around 0.08</output>

<result>2/25 = around 0.08</result>