A new road is newly built in a certain place, with a total length of 800 meters, and 320 meters have been built. What percentage of the total length has not yet been built?
某地新建一条公路，全长800米，已建好320米，未建的占全长的百分之几？
<gadget id="calculator">800 - 320</gadget>
<output>480</output>

<gadget id="calculator">480 / 800</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>