CAYLEY 2011 Problem 8

Past Contests CAYLEY CAYLEY - 2011
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1

If 2.4\times10^8 is doubled, then the result is equal to

Answer Choices
A. 2.4\times20^8
B. 4.8\times20^8
C. 4.8\times10^8
D. 2.4\times10^{16}
E. 4.8\times10^{16}