In the supermarket, white sugar is 5.2 yuan per kilogram, and mung beans are 7.5 yuan per kilogram. Mom bought 3 kilograms of white sugar and 2 kilograms of mung beans. How much is the total cost?
超市里白糖每千克5.2元，绿豆每千克7.5元，妈妈买了3千克白糖，2千克绿豆，一共要付多少元钱？
<gadget id="calculator">5.2 * 3</gadget>
<output>15.6</output>

<gadget id="calculator">7.5 * 2</gadget>
<output>15</output>

<gadget id="calculator">15.6 + 15</gadget>
<output>30.6</output>

<result>30.6</result>