A self-employed business first raised the price of the product by 80%, and then wrote in the advertisement "big bargain, 20% discount". After doing so, how much money can the self-employed earn at least for a color TV whose original price is 3,500 yuan?
某个体户先将商品的价格提高80%，然后在广告中写道"大酬宾，八折优惠"．这样做后，一台原价是3500元的彩电，该个体户至少可赚多少钱？
<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">3_500 * (9/5) * (4/5)</gadget>
<output>5_040</output>

<gadget id="calculator">5_040 - 3_500</gadget>
<output>1_540</output>

<result>1_540</result>