what is .000000025 expressed as a percentage? Is it 25 quadrillion of a percent?
NO!.
As a percentage it is=2.5 X 10^-6%
It is actually 1 / 40,000,000 of 1%, or one forty millionth of 1%.
First multiply it by 100 to get the percent .000000025 x 100 = .0000025 % or 25 ten millionths of a per cent
