The original price of a TV set is 3,500 yuan per set. During the Spring Festival, the shopping mall conducts promotional activities. The price is reduced (1/7), and the price is increased (1/4) after the event. How much is the current price of this TV set?
一种电视机原价3500元/台，商场在春节期间进行促销活动，降价(1/7)，活动结束后又加价(1/4)，这种电视机现价多少钱一台？
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 - (1/7)</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">3_500 * (6/7) * (5/4)</gadget>
<output>3_750</output>

<result>3_750</result>