In order to encourage residents to save water, the water company stipulates that each household will be charged 1.2 yuan per ton for water consumption within 15 tons (including 15 tons) per month; if it exceeds 15 tons, it will be charged at 5 yuan per ton. I used 19 tons of water last month, how much is the water fee?
为鼓励居民节约用水，自来水公司规定：每户每月用水15吨以内(含15吨)，按每吨1.2元收费；超过15吨的，其超出吨数按每吨5元收费，文文家上月用水19吨，需交水费多少元？
<gadget id="calculator">15 * 1.2</gadget>
<output>18</output>

<gadget id="calculator">19 - 15</gadget>
<output>4</output>

<gadget id="calculator">4 * 5</gadget>
<output>20</output>

<gadget id="calculator">18 + 20</gadget>
<output>38</output>

<result>38</result>