Known a kind of milk, 24 boxes/box, A supermarket sells 2.5 yuan/box, 58 yuan/box; B supermarket sells 2.6 yuan/box, 62 yuan/box, Uncle Wang will buy 30 boxes of milk in total, please do the math , which supermarket is cheap? How much do you need in total?
已知一种牛奶，24盒/箱，A超市卖2.5元/盒，58元/箱；B超市卖2.6元/盒，62元/箱，王叔叔一共要买30盒牛奶，请你算一算，哪家超市便宜？一共需要多少钱？
<gadget id="calculator">30 - 24</gadget>
<output>6</output>

<gadget id="calculator">6 * 2.5</gadget>
<output>15</output>

<gadget id="calculator">58 + 15</gadget>
<output>73</output>

<result>73</result>