Decimals and reciprocals: GRE quantitative reasoning question #103

 
Try the following GRE quantitative reasoning question that tests your understanding of dealing with decimal numbers and fractions.

Question#103:

When the decimal point of a certain positive decimal number is moved four places to the right, the new number is four times the reciprocal of the original number. What is the original number?

1. $\quad 0.0002$

2. $\quad 0.002$

3. $\quad 0.02$

4. $\quad 0.2$

5. $\quad 2$