Jinan Commercial Building has 540 LCD TVs, 220 were sold in the first week, and the remaining 80% were sold in the second week. How many sets are left?
济南商厦有液晶电视540台，第一周卖出220台，第二周卖出剩下的80%，还剩多少台？
<gadget id="calculator">540 - 220</gadget>
<output>320</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">320 * (1/5)</gadget>
<output>64</output>

<result>64</result>