Xiaoxiao has 10.2 yuan, and the naughty money is 8.2 yuan less than three times that of Xiaoxiao. How much is naughty?
笑笑有10.2元，淘气的钱比笑笑的3倍少8.2元，淘气多少钱？
<gadget id="calculator">10.2 * 3</gadget>
<output>30.6</output>

<gadget id="calculator">30.6 - 8.2</gadget>
<output>22.4</output>

<result>22.4</result>