The Spring Festival is approaching, and major shopping malls are offering promotions one after another. Among them, there is a kind of melon seeds, which cost 12 yuan per bag for a large bag and 4 yuan for a small bag. The following information has been collected: "Xinbai" shopping mall buys 1 big bag and gets 1 small bag free; "Tiantianhui" shopping mall offers 10% off; Now Xiaoli wants to buy 2 big bags and 4 small bags of this kind of melon seeds. Please be an advisor to Xiaoli, which shopping mall should she choose to buy the most cost-effective? (Please refer to the calculation instructions)
春节即将来临，各大商场纷纷出计促销．其中有一种瓜子，大包每包12元，小包每包4元．收集到以下信息："新一百"商场买1大包送1小包；"天天惠"商场一律打九折；"家得利"商场满30元后打八折．现在小丽想买这种瓜子2大包4小包．请你给小丽当参谋，她该选择哪家商场去买最合算？(请结合计算说明)
<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">24 + 16</gadget>
<output>40</output>

<gadget id="calculator">40 * 0.8</gadget>
<output>32</output>

<result>32</result>