Ship 2000 boxes of glass to the owner. According to the contract, if a box is delivered in good condition, the shipping fee will be 5 yuan, and if the box is damaged, the shipping fee will not be paid, and the owner will be compensated 40 yuan. After transporting this batch of glass, we received a payment of 9190 yuan. How many boxes were damaged?
给货主运2000箱玻璃．合同规定，完好运到一箱给运费5元，损坏一箱不给运费，还要赔给货主40元．将这批玻璃运到后收到运货款9190元，损坏了多少箱？
<gadget id="calculator">2_000 * 5</gadget>
<output>10_000</output>

<gadget id="calculator">10_000 - 9_190</gadget>
<output>810</output>

<gadget id="calculator">40 + 5</gadget>
<output>45</output>

<gadget id="calculator">810 / 45</gadget>
<output>18</output>

<result>18</result>