During the energy-saving and emission-reduction activities, the "Environmental Guardian" of the Experimental Primary School recycled 800 kilograms of waste paper. It is known that the non-renewable rate of waste paper is 20%. How many kilograms of recycled paper can be produced from the recycled waste paper?
在节能减排活动中，实验小学的"环保小卫士"共回收800千克废纸，据了解，废纸的不可再生率是20%，回收的这些废纸能生产多少千克再生纸？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">800 * (4/5)</gadget>
<output>640</output>

<result>640</result>