Guanghua Glass Factory entrusted a transportation company to transport 2,000 pieces of glass, and the transportation fee was 0.4 yuan for each piece. If one piece was damaged, the compensation for the loss was 7 yuan. As a result, the transportation company received a shipping fee of 711.2 yuan.
光华玻璃厂委托运输公司包运2000块玻璃，每块运输费0.4元，如损坏一块，要赔偿损失费7元，结果运输公司得到运费711.2元，问运输公司损失玻璃多少块？
<gadget id="calculator">2_000 * 0.4</gadget>
<output>800</output>

<gadget id="calculator">800 - 711.2</gadget>
<output>88.8</output>

<gadget id="calculator">7 + 0.4</gadget>
<output>7.4</output>

<gadget id="calculator">88.8 / 7.4</gadget>
<output>12</output>

<result>12</result>