The retail price of each bag of fresh milk is 1.75 yuan. Ding Ding’s family orders 2 bags per day in March, and the wholesale price is 1.60 yuan per bag. How much cheaper is Ding Ding’s order of fresh milk in March than the retail price?
保鲜奶每袋的零售价是1.75元，丁丁家三月份每天预订2袋，按批发价每袋1.60元计算，这样丁丁家三月份预订保鲜奶比安零售价购买便宜多少元？
<gadget id="calculator">1.75 - 1.6</gadget>
<output>0.15</output>

<gadget id="calculator">31 * 2 * 0.15</gadget>
<output>9.3</output>

<result>9.3</result>