The porter accepts the task of carrying 250 vases. If a complete vase is transported to the destination, the porter will be charged 20 yuan, and if one is damaged, the compensation will be 100 yuan. After transporting these vases, the workers had to pay a total of 4,400 yuan for the transportation, so how many vases were damaged by the porters?
搬运工接受搬运250个花瓶的任务，运一个完整的花瓶到目的地可得搬运费20元，损坏一个要倒赔100元．运完这批花瓶后，工人共得搬运费4400元，那么搬运工人损坏了多少个花瓶？
<gadget id="calculator">20 * 250</gadget>
<output>5_000</output>

<gadget id="calculator">5_000 - 4_400</gadget>
<output>600</output>

<gadget id="calculator">100 + 20</gadget>
<output>120</output>

<gadget id="calculator">600 / 120</gadget>
<output>5</output>

<result>5</result>