The original price of a piece of clothing was 550 yuan, and the price was reduced twice. First, it was sold at a 20% discount, and then the price was reduced by 10% of the 20% discount. How much is the final price of this dress?
一件衣服原价550元，先后两次降价出售，先按八折出售，然后又降价八折售价的10%．这件衣服最后售价是多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">550 * (4/5) * (9/10)</gadget>
<output>396</output>

<result>396</result>