Recycling 1 kg of waste paper can produce 0.8 kg of recycled paper. If each student in your class recycles 2.5 kilograms of waste paper, how many kilograms of recycled paper can be produced in total?
回收1千克废纸可以生产0.8千克再生纸．如果你们班学生每人回收2.5千克废纸，一共可以生产多少千克再生纸？
<gadget id="calculator">2.5 * 40</gadget>
<output>100</output>

<gadget id="calculator">0.8 * 100</gadget>
<output>80</output>

<result>80</result>