A school wants to give each of 1100 students a water cup, and each cup costs 3 yuan. During the "61st" period, the supermarket launched a discounted price, buy 10 get 1 free. In this way, how much money can the school save by purchasing water cups during the discount period compared with usual times?
某校要给1100名学生每人配一个水杯，每个水杯3元．"六一"期间超市推出优惠价，每买10个送1个．这样学校在优惠期购买水杯，可比平时节约多少钱？
<gadget id="calculator">10 + 1</gadget>
<output>11</output>

<gadget id="calculator">1_100 / 11</gadget>
<output>100</output>

<gadget id="calculator">3 * 100</gadget>
<output>300</output>

<result>300</result>