China's civil aviation regulations: Passengers taking a plane can carry up to 20 kilograms of luggage for free, and the excess luggage will be charged at 1.5% of the air ticket per kilogram. Xiao Zhang bought an air ticket of 800 yuan, and he paid a baggage fee of 60 yuan. How many kilograms does Xiao Zhang's luggage weigh?
中国民航规定：乘飞机的旅客每人最多可以免费携带20千克行李，超过的行李每千克按飞机票的1.5%付行李费．小张买的是800元的机票，他付了60元的行李费，小张的行李有多少千克？
<gadget id="calculator">1.5 / 100</gadget>
<output>0.015</output>

<gadget id="calculator">20 * 0.015 * 800</gadget>
<output>240</output>

<gadget id="calculator">240 + 60</gadget>
<output>300</output>

<gadget id="calculator">0.015 * 800</gadget>
<output>12</output>

<gadget id="calculator">300 / 12</gadget>
<output>25</output>

<result>25</result>