In order to encourage water conservation, a water company adopts the method of billing water in sections on a monthly basis. 2.5 yuan per ton within 12 tons; 3.8 yuan per ton for the part exceeding 12 tons. Xiao Ke’s family used 20 tons of water last month, how much should they pay for water?
某自来水公司为鼓励节约用水，采用按月分段计费的方法收取水费．12吨以内的每吨2.5元；超过12吨的部分，每吨3.8元．小可家上个月的用水量为20吨，应缴水费多少元？
<gadget id="calculator">2.5 * 12</gadget>
<output>30</output>

<gadget id="calculator">20 - 12</gadget>
<output>8</output>

<gadget id="calculator">3.8 * 8</gadget>
<output>30.4</output>

<gadget id="calculator">30 + 30.4</gadget>
<output>60.4</output>

<result>60.4</result>