In order to save water, the water company implements a tiered water price. The standard is: each household uses no more than 8 cubic meters (including 8 cubic meters) per month, 1.76 yuan per cubic meter, and 4.25 yuan per cubic meter for the excess. The two uncles share 32.6 cubic meters of water, of which 60% is used by Uncle Li’s household. How much water should Uncle Zhang’s family pay this month?
为节约用水，自来水公司实行阶梯水价，标准为：每户每月用水不超过8立方米(含8立方米)，每立方米1.76元，超出部分每立方米4.25元，某月李大爷和张大爷两家共用水32.6立方米，其中李大爷家用水量占60%，问张大爷家这个月应缴水费多少元？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">32.6 * (2/5)</gadget>
<output>13.04</output>

<gadget id="calculator">13.04 - 8</gadget>
<output>5.04</output>

<gadget id="calculator">5.04 * 4.25</gadget>
<output>21.42</output>

<gadget id="calculator">1.76 * 8</gadget>
<output>14.08</output>

<gadget id="calculator">21.42 + 14.08</gadget>
<output>35.5</output>

<result>35.5</result>