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?

$\quad 0.0002$

$\quad 0.002$

$\quad 0.02$

$\quad 0.2$

$\quad 2$
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