The original price of a barrel of edible oil is 36 yuan. In order to welcome 3.15, some supermarkets carry out promotional activities. Jiale Supermarket can buy 4 barrels for 112 yuan; Huimin Supermarket buys at the original price, and buys 3 barrels for free. Which supermarket do you think has a better price for cooking oil? How much cheaper per barrel?
一桶食用油原价36元，为迎接3.15，一些超市进行促销活动．家乐超市112元可以买4桶；惠民超市按原价购买，每买3桶送1桶．你认为哪家超市食用油的价格更优惠？每桶便宜多少钱？
<gadget id="calculator">112 / 4</gadget>
<output>28</output>

<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">36 * (3/4)</gadget>
<output>27</output>

<gadget id="calculator">28 - 27</gadget>
<output>1</output>

<result>1</result>