Civil aviation regulations: Passengers can carry up to 20 kilograms of luggage for free on the plane, and the overweight part can be purchased as a luggage ticket at 1.5% of the air ticket for each kilogram. Teacher Zhang flew from Beijing to Sanya with 35 kilograms of luggage, and the ticket price was 2460 yuan. How much should he buy a luggage check?
民航规定：旅客最多可免费携带20千克行李乘飞机，超重部分每千克按买飞机票的1.5%购买行李票．张老师携带35千克行李从北京飞往三亚，飞机票价为2460元．他应购买行李票多少元？
<gadget id="calculator">1.5 / 100</gadget>
<output>0.015</output>

<gadget id="calculator">35 - 20</gadget>
<output>15</output>

<gadget id="calculator">2_460 * 0.015 * 15</gadget>
<output>553.5</output>

<result>553.5</result>