A tit can eat about 900 pests in 12 days. According to this calculation, how many insects can a tit eat in a year? (The average month is calculated as 30 days.)
一只山雀12天大约能吃900只害虫，照这样计算，一只山雀一年大约能吃多少只虫？(平均每个月都按30天计算．)
<gadget id="calculator">900 / 12</gadget>
<output>75</output>

<gadget id="calculator">30 * 12</gadget>
<output>360</output>

<gadget id="calculator">75 * 360</gadget>
<output>27_000</output>

<result>27_000</result>