A catty of cabbage costs 1.5 yuan, and my mother bought 2.5 catties. How much did it cost?
一斤白菜1.5元钱，妈妈买了2.5斤，一共花了多少钱？
<gadget id="calculator">1.5 * 2.5</gadget>
<output>3.75</output>

<result>3.75</result>