5 yuan per kilogram of bananas, 3 yuan per 500 grams of apples, how much will it cost my mother to buy 3 kilograms of bananas and 1 kilogram of apples?
每千克香蕉5元，每500克苹果3元，妈妈买回3千克的香蕉和1千克的苹果，一共要花多少钱？
<gadget id="calculator">1_000 / 500</gadget>
<output>2</output>

<gadget id="calculator">3 * 1 * 2</gadget>
<output>6</output>

<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">6 + 15</gadget>
<output>21</output>

<result>21</result>