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Bunuel
Which of the following is equal to 1⁄5 of 0.02 percent?

A. 0.4
B. 0.04
C. 0.004
D. 0.0004
E. 0.00004

0.02 percent = 0.02/100 = 0.0002
1/5 of 0.02 percent = 1/5 x 0.0002 = 0.2 x 0.0002 = 0.00004 (option E)

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Bunuel
Which of the following is equal to 1⁄5 of 0.02 percent?

A. 0.4
B. 0.04
C. 0.004
D. 0.0004
E. 0.00004

To convert any percent to a decimal you need to divide that percent by 100 or multiply by \(10^-2\)
0.02% = \(0.02*10^-2\)

\(\frac{1}{5} = 0.2\)

\(0.2*0.02*10^-2\)
\(= 2*10^-1*2*10^-4\)
\(= 2^2*10^-5\)
\(= 4*10^-5\)
\(= 0.00004\)

Thus answer is E
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Being careful to remember that the percentage sign is (1/100) and keeping track of the "decimal zeros" when multiplying can be helpful here.

The question basically asks what is

0.2 times 0.02 times 0.01

You can see with the digits that this is going to leave you with a "4" at the end. The only thing that remains is to get that "4" into the 5th slot to the right of the decimal.

0.00004

Answer choice (E)
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