Beverages of the same brand and model in two supermarkets, A and B, are on sale at the same time. Supermarket A is 25 yuan per box, buy 4 boxes and get 1 box free; supermarket B is 24 yuan per box, and get 20 yuan in cash when you spend 100 yuan. If a company wants to buy 5 boxes of this drink, which supermarket do you think is the most cost-effective? Tell me your reasons.
甲、乙两个超市同一品牌同一型号的饮料同时在搞促销．甲超市是每箱25元，买4箱送1箱；乙超市是每箱24元，满100元返20元现金．某公司如果要买5箱这种饮料，你认为在哪个超市买合算？说说你的理由．
<gadget id="calculator">24 * 5</gadget>
<output>120</output>

<gadget id="calculator">120 - 20</gadget>
<output>100</output>

<result>100</result>