During the Spring Festival travel season, the air ticket price from Urumqi to Beijing increased by 10%, and the fare was 2640 yuan. How much was the air ticket price before the Spring Festival travel season?
春运期间，乌鲁木齐到北京的飞机票涨价10%后，票价为2640元，春运前的飞机票价是多少元？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 + (1/10)</gadget>
<output>11/10 = around 1.1</output>

<gadget id="calculator">2_640 / (11/10)</gadget>
<output>2_400</output>

<result>2_400</result>