The owner of a shopping mall sells a commodity. He is willing to sell it at least 20% higher than the purchase price. If you want to buy this product with a price tag of 540 yuan, how much can the boss reduce the price at most?
某商场老板销售一种商品，他至少要以高出进价20%的价格才愿意出售，但是为了获取多利润，他以高出进价80%的价格标价．如果你要买下标价为540元的这种商品，老板最多能降价多少元．
<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">540 / (9/5)</gadget>
<output>300</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">300 * (6/5)</gadget>
<output>360</output>

<gadget id="calculator">540 - 360</gadget>
<output>180</output>

<result>180</result>