Li Xiaojun bought 3 tickets of the same football game at a preferential price of 10% off, and the total cost was 81 yuan. How much is the original price of each ticket?
李小军按九折的优惠价格购买了3张同样的足球赛门票，一共用去81元．每张门票的原价是多少元？
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">81 / 3 / (9/10)</gadget>
<output>30</output>

<result>30</result>