In order to make huge profits, a store now prices the products at 80% of the profit, and then writes in the advertisement: "Big bargain, 20% discount." According to this method, the store made a profit from a color TV with a purchase price of 3,500 yuan. How much?
某商店为了谋取暴利，现将商品按80%的利润定价，然后再广告中写道："大酬宾，八折优惠．"照这样的做法，一台进价是3500元的彩电该商店赚了多少钱？
<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>