The school cafeteria needs to buy 330 bowls for 4 yuan each. The supermarket is holding a promotion, and every 10 bowls you buy will give you the same bowl. In this way, the school can buy bowls during the preferential period, which is much cheaper than usual.
学校食堂要买330个碗每个要4元，超市正在举办优惠促销，每买10个送一个同样的碗．这样学校在优惠期购买碗，可比平时便宜多少．
<gadget id="calculator">330 * 4</gadget>
<output>1_320</output>

<gadget id="calculator">10 + 1</gadget>
<output>11</output>

<gadget id="calculator">330 / 11</gadget>
<output>30</output>

<gadget id="calculator">330 - 30</gadget>
<output>300</output>

<gadget id="calculator">300 * 4</gadget>
<output>1_200</output>

<gadget id="calculator">1_320 - 1_200</gadget>
<output>120</output>

<result>120</result>