The workers transported 250 vases, and they were stipulated to pay a shipping fee of 20 yuan for the complete one to the destination, and 100 yuan for the damaged one. How many vases did they damage?
工人运250个花瓶，规定完整运一个到目的地给运费20元，损坏一个不仅不给运费还要倒赔100元，运完这批花瓶后，工人共得4400元．他们共损坏了几个花瓶？
<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>