How much should I pay for 24 stamps worth 8 cents and 15 stamps worth 6 cents?
我买24枚8角的邮票和15枚6角的邮票，一共要付多少钱？
<gadget id="calculator">24 * 0.8</gadget>
<output>19.2</output>

<gadget id="calculator">15 * 0.6</gadget>
<output>9</output>

<gadget id="calculator">19.2 + 9</gadget>
<output>28.2</output>

<result>28.2</result>