What is 0.4% written as a decimal?

a. 0.04
b. 0.4
c. 2.5
d. 0.004

Hi

All you have to do is divide 0.4 by 100

0.4 / 100 = 0.004

The answer is : D

I hope that's help:)

step-by-step explanation:

one of the most important purposes of surface treatment is to alter surface properties according to the requirement of specific applications. for example, hydrophobic coating has been utilized on windshield and eyeglasses. gold atom monolayer on substrate has become a popular surface bioconjugation strategy.