Dragon fruit is 14.6 yuan per kilogram, and banana is 6.4 yuan per kilogram. My family wants to buy 1.5 kilograms each. How much is the total cost?
火龙果每千克14.6元，香蕉每千克6.4元，我家想要各买1.5千克，一共需要多少元？
<gadget id="calculator">14.6 + 6.4</gadget>
<output>21</output>

<gadget id="calculator">21 * 1.5</gadget>
<output>31.5</output>

<result>31.5</result>