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How to do the sample questions in the second volume of the fourth grade mathematics easy 15?
Recycling 1 ton waste paper can produce 800 kilograms of paper, with a productivity of 80%.

1 ton = 1000 kg

800÷ 1000=0.8=80%

35*4.86= 170. 1 kg

170. 1 * 80% = 136.08kg。

A: These papers can produce136.08kg recycled paper.

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