In order to encourage water saving, a water supply company adopts the method of monthly segmental calculation to collect water fees, 2.5 yuan per ton for less than 12 tons, and 3.8 yuan per ton for the part exceeding 12 tons. The water consumption of Grandma Li’s house last month was 19 tons, how much is the water fee payable?
某自来水公司为鼓励节约用水，采取按月分段计算的方法收取水费，12吨以内的每吨2.5元，超过12吨的部分，每吨3.8元，李奶奶家上个月的用水量是19吨，应缴水费多少元？
<gadget id="calculator">2.5 * 12</gadget>
<output>30</output>

<gadget id="calculator">19 - 12</gadget>
<output>7</output>

<gadget id="calculator">3.8 * 7</gadget>
<output>26.6</output>

<gadget id="calculator">30 + 26.6</gadget>
<output>56.6</output>

<result>56.6</result>