A passenger carries 30 kilograms of luggage. According to civil aviation regulations, a passenger can carry up to 20 kilograms of luggage. For each kilogram of excess weight, a luggage ticket is purchased at 1.5% of the plane fare. How much should the price be.
一位旅客携带了30千克的行李，按民航规定，旅客最多携带20千克行李，超重部分每千克按飞机票价的1.5%购买行李票，现在旅客购买120元的行李票，则它的飞机票价应是多少元．
<gadget id="calculator">30 - 20</gadget>
<output>10</output>

<gadget id="calculator">1.5 / 100</gadget>
<output>0.015</output>

<gadget id="calculator">120 / 10 / 0.015</gadget>
<output>800</output>

<result>800</result>