In order to build a conservation-oriented society and strengthen citizens' awareness of water conservation, a certain city has established the following water charging standards. When the monthly water consumption of each household does not exceed 10 tons, the water fee per ton is 0.8 yuan; if it exceeds 10 tons, the excess is charged per ton The water fee will be increased by 50% on the basis of 0.8 yuan per ton. Uncle Wang’s family used 28 tons of water last month. How much is the water bill?
为构建节约型社会，加强公民节水意识，某城市制定了以下用水收费标准，每户每月用水量不超过10吨时，每吨水费为0.8元；如果超过10吨，超出部分每吨水费在每吨0.8元的基础上要加价50%．王大伯家上个月用水28吨，需要交水费多少元？
<gadget id="calculator">10 * 0.8</gadget>
<output>8</output>

<gadget id="calculator">28 - 10</gadget>
<output>18</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">0.8 * (1/2)</gadget>
<output>0.4</output>

<gadget id="calculator">0.8 + 0.4</gadget>
<output>1.2</output>

<gadget id="calculator">18 * 1.2</gadget>
<output>21.6</output>

<gadget id="calculator">8 + 21.6</gadget>
<output>29.6</output>

<result>29.6</result>