5 * 10^3 * 6.12*10^7 = 30.6 * 10^(3 + 7) = 30.6 * 10^10 = 3.06 * 10^1 * 10^10 = 3.06 * 10^(10 + 1) = 3.06 * 10^11 <<< Answer
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