The company is planning to charter a bus to take employees who live in other places home for the New Year. The cost of the chartered bus is fixed. According to the statistics of the number of employees in other places, each person needs to pay 15 yuan. Later, 6 people did not go back, so each person paid an extra 3 yuan. How much is the car rental fee.
公司准备包一辆客车送家在外地的员工回家过年，包车的费用是固定的．根据外地员工人数统计，每人需付15元．后来有6人不回去，这样每人多付3元．包车费用是多少元．
<gadget id="calculator">6 * 15</gadget>
<output>90</output>

<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">90 + 18</gadget>
<output>108</output>

<gadget id="calculator">3 - 15</gadget>
<output>-12</output>

<gadget id="calculator">15 + (-12)</gadget>
<output>3</output>

<gadget id="calculator">108 / 3</gadget>
<output>36</output>

<gadget id="calculator">36 * 15</gadget>
<output>540</output>

<result>540</result>