The store priced a certain TV set at 140% of the purchase price, and then advertised "20% discount, free 50 yuan taxi fare". As a result, each TV still made a profit of 70 yuan. How much is the purchase price of each TV set?
商店将某款电视机按进价140%标价，然后打出"八折酬宾，外送50元出租车费"的广告，结果每台仍获利70元．每台电视机的进价是多少元？
<gadget id="calculator">70 + 50</gadget>
<output>120</output>

<gadget id="calculator">140 / 100</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(7/5) * (4/5)</gadget>
<output>28/25 = around 1.12</output>

<gadget id="calculator">(28/25) - 1</gadget>
<output>3/25 = around 0.12</output>

<gadget id="calculator">120 / (3/25)</gadget>
<output>1_000</output>

<result>1_000</result>