PLEASE HELP!!!

Which of the following shows 2/5, 42%, 4.02 x 10^-1, and 0.39 ordered from least to greatest?
A. 2/5, 0.39, 42%, 4.02 x 10^-1
B. 0.39, 4.02 x 10^-1, 2/5, 42%
C. 0.39, 2/5, 4.02 x 10^-1, 42%
D. 42%, 4.02 x 10^-1, 2/5, 0.39

Question

PLEASE HELP!!!

Which of the following shows 2/5, 42%, 4.02 x 10^-1, and 0.39 ordered from least to greatest?
A.		 2/5, 0.39, 42%, 4.02 x 10^-1
B.		 0.39, 4.02 x 10^-1, 2/5, 42%
C.		 0.39, 2/5, 4.02 x 10^-1, 42%
D.		 42%, 4.02 x 10^-1, 2/5, 0.39

mertsj · Answer

Change them all to decimals with 3 numbers after the decimal point.

anonymous · Answer

I did .. 
i got 2/5 = .400
42%=.420
4.02=4.02
10^-1=.100
.39=.39

anonymous · Answer

I thought 10^-1 would go first !

anonymous · Answer

@Mertsj

mertsj · Answer

$$4.02 \times 10^{-1}=.402$$