To fit the hole.
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Manhole covers are round because that is the only shape that will not fall in on itself. Having a round cover with a lip, there is no way the cover can fall or be forced into the hole it covers.
76.3 is round to 76.0
76.3 is round to 76.0
Round your percentage and that should be it.
It would round to 16 as a whole number.