GAUSS7 2010 Problem 6

Past Contests GAUSS7 GAUSS (GR. 7) - 2010
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1

If 10.0003\times\Box=10000.3, the number that should replace the \Box is

Answer Choices
A. 100
B. 1000
C. 10000
D. 0.001
E. 0.0001