The porter has to carry 1,000 glass bottles. It is stipulated that the moving fee is 30 cents for moving one, and 50 cents for breaking one. As a result, the shipping fee is 260 yuan after transportation. How many glass bottles did the porter break?
搬运工人要搬运1000只玻璃瓶，规定搬运一只可得搬运费3角，打碎一只要赔5角，结果运完后得运费260元，搬运工人打碎了几个玻璃瓶？
<gadget id="calculator">1_000 * 0.3</gadget>
<output>300</output>

<gadget id="calculator">300 - 260</gadget>
<output>40</output>

<gadget id="calculator">0.3 + 0.5</gadget>
<output>0.8</output>

<gadget id="calculator">40 / 0.8</gadget>
<output>50</output>

<result>50</result>