An electrical appliance factory sells a batch of TV sets at a price of 2,400 yuan each, and expects to make a profit of 72,000 yuan, but in fact, the profit margin is reduced by 25% due to an increase in cost (1/6). Ask for the number of these TV sets?
某电器厂销售一批电视机，每台售价2400元，预计获利72000元，但实际上由于成本提高了(1/6)，所以利润率降低了25%．求这批电视机的台数？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/4) / (1/6)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">72_000 * (3/2)</gadget>
<output>108_000</output>

<gadget id="calculator">108_000 + 72_000</gadget>
<output>180_000</output>

<gadget id="calculator">180_000 / 2_400</gadget>
<output>75</output>

<result>75</result>