The shopping mall is engaged in promotional activities, 20 yuan in cash will be refunded when the purchase is over 400 yuan, and each bag of roll paper is 16 yuan. How much does it actually cost for Mrs. Wang, the property manager, to buy 32 bags of such roll paper?
商场搞促销活动，满400元返还20元现金，每袋卷纸16元，物管王大妈买这样的卷纸32袋，实际需付多少钱？
<gadget id="calculator">16 * 32</gadget>
<output>512</output>

<gadget id="calculator">512 - 20</gadget>
<output>492</output>

<result>492</result>