Answer
C
Work Step by Step
$155*2 = 310$ million
$310,000,000 = 31*10,000,000$
$31*10,000,000 = 3.1*10*10*10*10*10*10*10*10$
$3.1*10*10*10*10*10*10*10*10 = 3.1 * 10^8$
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