The ceramic craft factory entrusts the transportation company to deliver 10,000 ceramic vases, each with a cost price of 7.5 yuan. The two parties stipulated in the contract that the freight for each vase is 4% of the cost price. , after exchanging the goods with Wanli Company, the transporter got 2966 yuan for shipping, so how many vases were broken during the transportation?
陶瓷工艺厂委托运输公司送10000只陶瓷花瓶，每只成本价7.5元，双方在合同中规定，每只的运费为成本价的4%，若损坏，每只扣除运费，并赔付损失费8.2元，运输员在和万利公司交换货物后，得到2966元运费，那么在运输过程中，打破了几只花瓶？
<gadget id="calculator">4 / 100</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">10_000 * 7.5 * (1/25)</gadget>
<output>3_000</output>

<gadget id="calculator">3_000 - 2_966</gadget>
<output>34</output>

<gadget id="calculator">7.5 * (1/25)</gadget>
<output>0.3</output>

<gadget id="calculator">0.3 + 8.2</gadget>
<output>8.5</output>

<gadget id="calculator">34 / 8.5</gadget>
<output>4</output>

<result>4</result>