Q from Destroyer (vs Kaplan) about DNA Replication

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tawaqul

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In Destroyer, #237, it says : Consider a sample of DNA that undergoes 4 rounds of replication. What % of the double stranded DNA produced contains part of the original-stranded DNA?
Answer: 12.5%

now from the Kaplan Midterm, #7 (the question number may be incorrect): If a DNA molecule were to replicate itself 3 times, what % of the total DNA present would be comprised of the original DNA molecule?
Answer: 12.5%


So is there an error somewhere here? The way that makes sense to me is to take 1/2 and raise it to a power (power= the number of replications). So in these 2 problems, only Kaplan seems right to me. But maybe I'm missing something, help!
 
this has been discussed before. do a search there was a great thread on this with a diagram.
 
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