Correct Answer: Option C
(0.15 ×10m)/(0.3×10k) = 5 × 107
=> (10m)/(2×10k) = 5 × 107
=> (10m)/(10k) = 2×5 × 107
=> (10m)/(10k) = 10 ×107
=> (10m)/(10k) = 108
=> 10m - k = 108
=> m - k = 8
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