A certain brand of clothing is on promotion, the price will be reduced by 10% first, and then 80% of the original price will be refunded in cash. What percentage is the actual price cut for this brand of clothing?
某品牌服装做促销，先降价10%，再返还原价的80%现金．这个品牌服装，实际降价百分之几？
<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">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 * (9/10) * (1/5)</gadget>
<output>9/50 = around 0.18</output>

<gadget id="calculator">1 - (9/50)</gadget>
<output>41/50 = around 0.82</output>

<gadget id="calculator">(41/50) / 1</gadget>
<output>41/50 = around 0.82</output>

<result>41/50 = around 0.82</result>