Civil Aviation of China stipulates that a passenger in the ordinary class of an airplane can carry up to 20 kilograms of luggage for free, and the excess part will be purchased as a luggage ticket at 1.5% of the plane fare for each kilogram. A passenger took the plane with 40 kilograms of luggage and paid a total of 1170 yuan for the air ticket and luggage fee. How much is the air ticket?
中国民航规定：乘坐飞机普通舱旅客一人最多可免费携带20千克行李，超过部分每千克按飞机票价的1.5%购买行李票．一名旅客带了40千克行李乘机，机票连同行李费共付1170元．机票的价钱是多少？
<gadget id="calculator">1_170 / 1.3</gadget>
<output>900</output>

<result>900</result>