A glass factory consigns 250 boxes of glass, and the contract stipulates that the shipping fee for each box is 20 yuan. If one box is damaged, not only the shipping fee will not be paid, but also the compensation will be 100 yuan. At the time of settlement after shipment, a total of 4,400 yuan should be paid for the freight. How many cases of glass were damaged in the shipment?
某玻璃厂托运玻璃250箱，合同规定每箱运费20元，如果损坏一箱，不但不付运费还要赔偿100元．运后结算时，共付运费4400元．托运中损坏了多少箱玻璃？
<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>