My mother participated in the 20% off and 10% off event, and bought a dress with a price tag of 495 yuan. Mom paid 400 yuan. How much should I get back?
妈妈参加了八折再打九折的活动，买了一件标价495元的连衣裙，妈妈付了400元，应找回多少钱？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">495 * (4/5) * (9/10)</gadget>
<output>1_782/5 = around 356.4</output>

<gadget id="calculator">400 - (1_782/5)</gadget>
<output>218/5 = around 43.6</output>

<result>218/5 = around 43.6</result>