In order to encourage citizens to save water, a certain city stipulates the charging standard as follows: 2.4 yuan per ton for water consumption within 10 tons (including 10 tons) per month; 3.6 yuan per ton for the part exceeding 10 tons. The water consumption of Xiaodong’s family in September was 18 tons. How much is the water fee?
某市为鼓励市民节约用水，规定收费标准如下：每月用水10吨以内(包括10吨)，每吨2.4元；超过10吨的部分，每吨3.6元．小冬家9月份用水量为18吨，应缴水费多少元？
<gadget id="calculator">2.4 * 10</gadget>
<output>24</output>

<gadget id="calculator">18 - 10</gadget>
<output>8</output>

<gadget id="calculator">3.6 * 8</gadget>
<output>28.8</output>

<gadget id="calculator">24 + 28.8</gadget>
<output>52.8</output>

<result>52.8</result>