In order to encourage citizens to save water, the water company of a certain city stipulates that if the monthly water consumption of each household is within 3 tons (including 3 tons), it will be charged at 4 yuan per ton; if it exceeds 3 tons, it will be charged at 8 yuan per ton. In February this year, Grandpa Li used 9 tons of water at home. How much should his family pay for water this month?
为鼓励市民节约用水，某市自来水公司规定：每户居民每月用水量在3吨(含3吨)以内，按每吨4元收费；超过3吨，超过部分按每吨8元收费．今年2月份，李爷爷家用了9吨水，他家这个月应交水费多少元？
<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<gadget id="calculator">9 - 3</gadget>
<output>6</output>

<gadget id="calculator">6 * 8</gadget>
<output>48</output>

<gadget id="calculator">12 + 48</gadget>
<output>60</output>

<result>60</result>