In order to encourage water conservation, a water company in a city adopts the method of monthly billing and billing for water. 2.5 yuan per ton within 12 tons, 3.8 yuan per ton for the part exceeding 12 tons. Xiao Ke's family used 17 tons of water last month. How much is the water fee?
某市自来水公司为鼓励节约用水，采取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17吨，应缴水费多少元？
<gadget id="calculator">2.5 * 12</gadget>
<output>30</output>

<gadget id="calculator">17 - 12</gadget>
<output>5</output>

<gadget id="calculator">3.8 * 5</gadget>
<output>19</output>

<gadget id="calculator">30 + 19</gadget>
<output>49</output>

<result>49</result>