What size should I make a partition to appear as a standard number e.g 10gb 100Gb perfect

What size should I make a partition to appear as a standard number e.g 10gb 100Gb perfect

For every 10GB add 8MB.

For every 100GB add 80MB.

For Perfect 100GB Drive.

100GB Drive = 100 X 1024 = 102400MB (Displayed as 99.99GB)

Perfect 100GB Drive = 10 x 10240 + 10 x 8 = 102480MB (Displayed as 100.00GB)