Aunt Zhang went to the supermarket and bought 3 bags of washing powder with a unit price of 13.5 yuan. How much should Aunt Zhang pay?
张阿姨到超市买了3袋单价是13.5元的洗衣粉，张阿姨应付多少钱？
<gadget id="calculator">13.5 * 3</gadget>
<output>40.5</output>

<result>40.5</result>