Zhang Hua bought 25 boxes of cold capsules at the Daming Pharmacy for 925 yuan. When he came to the medicine wholesale market, he learned that the wholesale price was 30 yuan per box. How much cheaper is the wholesale price per box than the retail price?
张华用925元在大明药店购买了25盒感冒胶囊，来到医药批发市场了解到，批发价每盒30元．每盒批发价比零售价便宜多少钱？
<gadget id="calculator">925 / 25</gadget>
<output>37</output>

<gadget id="calculator">37 - 30</gadget>
<output>7</output>

<result>7</result>