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"Plaque OR g 20 microns" likely refers to the thickness of the gold plating on the clock. The term "20 microns" specifies the thickness of the gold layer, which is a common measurement unit for plating thickness. The "OR" indicates that the gold plating could be either a layer of gold (plaque) or a certain grade (g) of gold, with 20 microns being the thickness in either case.
One way is to do 20 mil, but that might confuse people into thinking 20 thousand.
It looks like 15/20, o, if you prefer, 15/20.
To determine the total thickness of 5000 20-dollar notes, we first need to find the thickness of a single note. The thickness of a US dollar bill is approximately 0.0043 inches. Therefore, the thickness of a 20-dollar note would be the same. Multiplying the thickness of a single note by the total number of notes (0.0043 inches x 5000) gives us a total thickness of 21.5 inches.
2000%