In order to build a conservation-oriented society and strengthen citizens' water-saving awareness, Lintao County has formulated the following water charging standards: when the monthly water consumption of each household does not exceed 10 tons, the water fee per ton is 4.5 yuan; if it exceeds 10 tons, the excess part is charged per ton Water, the water fee will be increased by 20% on the basis of 4.5 yuan per ton. Uncle Zhang’s family used 18 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，临洮县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4.5元；如果超过10吨，超出部分每吨水，水费在每吨4.5元的基础上要加价20%．张大伯家上个月用水18吨，需交水费多少元？
<gadget id="calculator">4.5 * 10</gadget>
<output>45</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">18 - 10</gadget>
<output>8</output>

<gadget id="calculator">4.5 * (6/5) * 8</gadget>
<output>43.2</output>

<gadget id="calculator">45 + 43.2</gadget>
<output>88.2</output>

<result>88.2</result>