This is a currency note from the Bank of the United States and is not an obligation of the United States government. The Treasury Department did not issue notes intended for circulation as currency until 1862.
The grommet panel must be a minimum of 70 inches wide, between the side hem seams, to provide just slightly more than 1.5 times fullness on the 40-inch space.
The width of the curtain panel, as listed on the packaging, is the flat width of the panel -- unless the package indicates otherwise. If the package lists the flat panel measurement as 54 inches, and the area to cover is 100 inches at double fullness, divide 200 by 54 for the result of four panels.