Mom goes to the fruit supermarket to buy fruit, apples are 4.5 yuan per kilogram, and oranges are 3.6 yuan per kilogram. Mom bought 3 kilograms of two kinds of fruit, how much does mother need to pay in total?
妈妈到水果超市买水果，苹果每千克4.5元，桔子每千克3.6元．妈妈买了两种水果各3千克，妈妈总共需要付多少钱？
<gadget id="calculator">4.5 + 3.6</gadget>
<output>8.1</output>

<gadget id="calculator">8.1 * 3</gadget>
<output>24.3</output>

<result>24.3</result>