In order to encourage residents to save water, a city stipulates that if the monthly water consumption is less than 15 tons, the water price will be 1.8 yuan per ton; if the water consumption exceeds 15 tons, the water price will be 2.5 yuan per ton. Grandma Wang's house uses 22 tons of water in January. How much is the water bill?
为了鼓励居民节约用水，某市规定，每月用水量在15吨以内的，水价每吨1.8元；超过15吨的部分，每吨水价2.5元．王奶奶家一月份用水量是22吨，应缴水费多少元？
<gadget id="calculator">1.8 * 15</gadget>
<output>27</output>

<gadget id="calculator">22 - 15</gadget>
<output>7</output>

<gadget id="calculator">2.5 * 7</gadget>
<output>17.5</output>

<gadget id="calculator">27 + 17.5</gadget>
<output>44.5</output>

<result>44.5</result>