In order to encourage water conservation, the Shantou Water Supply Company adopts the method of monthly billing in sections, 3.5 yuan per ton for less than 15 tons, and 4.5 yuan per ton for the part exceeding 15 tons. Mr. Zhang’s house uses 32 tons of water this month. How much is the water bill?
汕头自来水公司为了鼓励节约用水，采取按月分段计费的方法收取水费，15吨以内的每吨3.5元，超过15吨的部分，每吨4.5元．张老师家这个月用水32吨，应缴水费多少元？
<gadget id="calculator">15 * 3.5</gadget>
<output>52.5</output>

<gadget id="calculator">32 - 15</gadget>
<output>17</output>

<gadget id="calculator">17 * 4.5</gadget>
<output>76.5</output>

<gadget id="calculator">52.5 + 76.5</gadget>
<output>129</output>

<result>129</result>