The cafeteria bought 18 kilograms of eggplants and 18 kilograms of tomatoes, 2.4 yuan per kilogram of eggplants, and 3.6 yuan per kilogram of tomatoes. How much did you spend on these two vegetables?
食堂买回茄子和西红柿各18千克，每千克茄子2.4元，每千克西红柿3.6元，买这两种菜一共花了多少钱？
<gadget id="calculator">2.4 + 3.6</gadget>
<output>6</output>

<gadget id="calculator">18 * 6</gadget>
<output>108</output>

<result>108</result>